diff --git a/implement-and-rewrite-tests/implement-tests-with-node-test/1-get-angle-type.test.js b/implement-and-rewrite-tests/implement-tests-with-node-test/1-get-angle-type.test.js
index cf50f6cad..bf52cc6c9 100644
--- a/implement-and-rewrite-tests/implement-tests-with-node-test/1-get-angle-type.test.js
+++ b/implement-and-rewrite-tests/implement-tests-with-node-test/1-get-angle-type.test.js
@@ -3,10 +3,37 @@ import test from "node:test";
 
 import { getAngleType } from "../implement/1-get-angle-type.js";
 
-// TODO: Write tests to cover all cases, including boundary and invalid cases.
-// Example: Identify Right Angles
-
 test("Classifies right angles", () => {
   const right = getAngleType(90);
   assert.equal(right, "Right angle");
 });
+
+test("Classifies acute angles", () => {
+  assert.equal(getAngleType(1), "Acute angle");
+  assert.equal(getAngleType(45), "Acute angle");
+  assert.equal(getAngleType(89), "Acute angle");
+});
+
+test("Classifies obtuse angles", () => {
+  assert.equal(getAngleType(91), "Obtuse angle");
+  assert.equal(getAngleType(120), "Obtuse angle");
+  assert.equal(getAngleType(179), "Obtuse angle");
+});
+
+test("Classifies straight angles", () => {
+  const straight = getAngleType(180);
+  assert.equal(straight, "Straight angle");
+});
+
+test("Classifies reflex angles", () => {
+  assert.equal(getAngleType(181), "Reflex angle");
+  assert.equal(getAngleType(270), "Reflex angle");
+  assert.equal(getAngleType(359), "Reflex angle");
+});
+
+test("Classifies angles outside the valid range as invalid", () => {
+  assert.equal(getAngleType(-10), "Invalid angle");
+  assert.equal(getAngleType(0), "Invalid angle");
+  assert.equal(getAngleType(360), "Invalid angle");
+  assert.equal(getAngleType(400), "Invalid angle");
+});
diff --git a/implement-and-rewrite-tests/implement-tests-with-node-test/3-get-card-value.test.js b/implement-and-rewrite-tests/implement-tests-with-node-test/3-get-card-value.test.js
index f5092d9b1..91c89c74d 100644
--- a/implement-and-rewrite-tests/implement-tests-with-node-test/3-get-card-value.test.js
+++ b/implement-and-rewrite-tests/implement-tests-with-node-test/3-get-card-value.test.js
@@ -3,14 +3,50 @@ import test from "node:test";
 
 import { getCardValue } from "../implement/3-get-card-value.js";
 
-// TODO: Write tests to cover all outcomes, including throwing errors for invalid cards.
+test("Returns the correct value for every valid rank and suit", () => {
+  const expectedValues = {
+    A: 11,
+    2: 2,
+    3: 3,
+    4: 4,
+    5: 5,
+    6: 6,
+    7: 7,
+    8: 8,
+    9: 9,
+    10: 10,
+    J: 10,
+    Q: 10,
+    K: 10,
+  };
+  const suits = ["♠", "♥", "♦", "♣"];
 
-test("Valid single-digit card", () => {
-  assert.equal(getCardValue("9♠"), 9);
+  for (const [rank, value] of Object.entries(expectedValues)) {
+    for (const suit of suits) {
+      assert.equal(getCardValue(`${rank}${suit}`), value);
+    }
+  }
 });
 
-test("Arbitrary non-card string", () => {
-  assert.throws(() => getCardValue("invalid"), /Expected a number followed by a suit, but got "invalid"/, "Expected clear error");
-});
+test("Throws an error for invalid card formats", () => {
+  const invalidCards = [
+    "A",
+    "invalid",
+    "1♠",
+    "11♠",
+    "02♠",
+    "0x02♦",
+    "2.1♦",
+    "0002♦",
+    "2.5♠",
+    " 2♠",
+    "A?",
+    "",
+  ];
 
-// TODO: What other invalid card cases can you think of?
+  for (const card of invalidCards) {
+    assert.throws(() => getCardValue(card), {
+      message: `Expected a number followed by a suit, but got "${card}"`,
+    });
+  }
+});
diff --git a/implement-and-rewrite-tests/implement/1-get-angle-type.js b/implement-and-rewrite-tests/implement/1-get-angle-type.js
index 8a6fba050..2fcbad01e 100644
--- a/implement-and-rewrite-tests/implement/1-get-angle-type.js
+++ b/implement-and-rewrite-tests/implement/1-get-angle-type.js
@@ -17,5 +17,24 @@
 // execute the code to ensure all tests pass.
 
 export function getAngleType(angle) {
-  // TODO: Implement this function
+  if (angle === 90) {
+    return "Right angle";
+  }
+  if (angle > 0 && angle < 90) {
+    return "Acute angle";
+  }
+
+  if (angle > 90 && angle < 180) {
+    return "Obtuse angle";
+  }
+
+  if (angle === 180) {
+    return "Straight angle";
+  }
+
+  if (angle > 180 && angle < 360) {
+    return "Reflex angle";
+  }
+
+  return "Invalid angle";
 }
diff --git a/implement-and-rewrite-tests/implement/2-is-proper-fraction.js b/implement-and-rewrite-tests/implement/2-is-proper-fraction.js
index f983800f0..0b4a4d686 100644
--- a/implement-and-rewrite-tests/implement/2-is-proper-fraction.js
+++ b/implement-and-rewrite-tests/implement/2-is-proper-fraction.js
@@ -14,5 +14,5 @@
 // execute the code to ensure all tests pass.
 
 export function isProperFraction(numerator, denominator) {
-  // TODO: Implement this function
+  return numerator < denominator;
 }
diff --git a/implement-and-rewrite-tests/implement/3-get-card-value.js b/implement-and-rewrite-tests/implement/3-get-card-value.js
index 9614ab1ee..56f935df2 100644
--- a/implement-and-rewrite-tests/implement/3-get-card-value.js
+++ b/implement-and-rewrite-tests/implement/3-get-card-value.js
@@ -23,6 +23,33 @@
 // After you have implemented the function, write tests to cover all the cases, and
 // execute the code to ensure all tests pass.
 
+const cardValues = new Map([
+  ["A", 11],
+  ["2", 2],
+  ["3", 3],
+  ["4", 4],
+  ["5", 5],
+  ["6", 6],
+  ["7", 7],
+  ["8", 8],
+  ["9", 9],
+  ["10", 10],
+  ["J", 10],
+  ["Q", 10],
+  ["K", 10],
+]);
+
 export function getCardValue(card) {
-  // TODO: Implement this function
+  const suit = card.slice(-1);
+  const rank = card.slice(0, -1);
+
+  if (!["♠", "♥", "♦", "♣"].includes(suit)) {
+    throw new Error(`Expected a number followed by a suit, but got "${card}"`);
+  }
+
+  if (cardValues.has(rank)) {
+    return cardValues.get(rank);
+  }
+
+  throw new Error(`Expected a number followed by a suit, but got "${card}"`);
 }
diff --git a/implement-and-rewrite-tests/rewrite-tests-with-jest/1-get-angle-type.test.js b/implement-and-rewrite-tests/rewrite-tests-with-jest/1-get-angle-type.test.js
index e0ba786ab..0b7729450 100644
--- a/implement-and-rewrite-tests/rewrite-tests-with-jest/1-get-angle-type.test.js
+++ b/implement-and-rewrite-tests/rewrite-tests-with-jest/1-get-angle-type.test.js
@@ -7,12 +7,42 @@ import { getAngleType } from "../implement/1-get-angle-type.js";
 test(`should return "Acute angle" when (0 < angle < 90)`, () => {
   // Test various acute angles, including boundary cases
   expect(getAngleType(1)).toEqual("Acute angle");
+  expect(getAngleType(0.5)).toEqual("Acute angle");
   expect(getAngleType(45)).toEqual("Acute angle");
+  expect(getAngleType(89.5)).toEqual("Acute angle");
   expect(getAngleType(89)).toEqual("Acute angle");
 });
 
 // Case 2: Right angle
+test('should return "right angle" when angle is 90', () => {
+  expect(getAngleType(90)).toEqual("Right angle");
+});
 // Case 3: Obtuse angles
+test('should return "Obtuse angle" when (90 < angle < 180)', () => {
+  expect(getAngleType(90.5)).toEqual("Obtuse angle");
+  expect(getAngleType(91)).toEqual("Obtuse angle");
+  expect(getAngleType(120)).toEqual("Obtuse angle");
+  expect(getAngleType(179.5)).toEqual("Obtuse angle");
+  expect(getAngleType(179)).toEqual("Obtuse angle");
+});
 // Case 4: Straight angle
+test('should return "Straight angle" when angle is 180', () => {
+  expect(getAngleType(180)).toEqual("Straight angle");
+});
 // Case 5: Reflex angles
+test('should return "Reflex angle" when (180 < angle < 360)', () => {
+  expect(getAngleType(180.5)).toEqual("Reflex angle");
+  expect(getAngleType(181)).toEqual("Reflex angle");
+  expect(getAngleType(270)).toEqual("Reflex angle");
+  expect(getAngleType(359.5)).toEqual("Reflex angle");
+  expect(getAngleType(359)).toEqual("Reflex angle");
+});
 // Case 6: Invalid angles
+
+test('should return "Invalid angle" for invalid angles', () => {
+  expect(getAngleType(-1)).toEqual("Invalid angle");
+  expect(getAngleType(-10)).toEqual("Invalid angle");
+  expect(getAngleType(0)).toEqual("Invalid angle");
+  expect(getAngleType(360)).toEqual("Invalid angle");
+  expect(getAngleType(400)).toEqual("Invalid angle");
+});
diff --git a/implement-and-rewrite-tests/rewrite-tests-with-jest/2-is-proper-fraction.test.js b/implement-and-rewrite-tests/rewrite-tests-with-jest/2-is-proper-fraction.test.js
index 5d49e2d8b..92d8f95c3 100644
--- a/implement-and-rewrite-tests/rewrite-tests-with-jest/2-is-proper-fraction.test.js
+++ b/implement-and-rewrite-tests/rewrite-tests-with-jest/2-is-proper-fraction.test.js
@@ -6,3 +6,30 @@ import { isProperFraction } from "../implement/2-is-proper-fraction.js";
 test(`should return false when denominator is zero`, () => {
   expect(isProperFraction(1, 0)).toEqual(false);
 });
+test("should return true for a proper fraction", () => {
+  expect(isProperFraction(1, 2)).toEqual(true);
+});
+
+test("should return false when numerator equals denominator", () => {
+  expect(isProperFraction(5, 5)).toEqual(false);
+});
+
+test("should return false when numerator is greater than denominator", () => {
+  expect(isProperFraction(7, 3)).toEqual(false);
+});
+
+test("should return true when numerator is zero", () => {
+  expect(isProperFraction(0, 5)).toEqual(true);
+});
+
+test("should return true when both numerator and denominator are negative and form a proper fraction", () => {
+  expect(isProperFraction(-1, -2)).toEqual(true);
+});
+
+test("should return true for negative numerator and positive denominator", () => {
+  expect(isProperFraction(-1, 2)).toEqual(true);
+});
+
+test("should return false for positive numerator and negative denominator", () => {
+  expect(isProperFraction(1, -2)).toEqual(false);
+});
diff --git a/implement-and-rewrite-tests/rewrite-tests-with-jest/3-get-card-value.test.js b/implement-and-rewrite-tests/rewrite-tests-with-jest/3-get-card-value.test.js
index a6de5a82a..48e620208 100644
--- a/implement-and-rewrite-tests/rewrite-tests-with-jest/3-get-card-value.test.js
+++ b/implement-and-rewrite-tests/rewrite-tests-with-jest/3-get-card-value.test.js
@@ -1,18 +1,50 @@
 import { getCardValue } from "../implement/3-get-card-value.js";
 
-// TODO: Write tests in Jest syntax to cover all possible outcomes.
+test("Returns the value of number cards from 2 to 10", () => {
+  const suits = ["♠", "♥", "♦", "♣"];
 
-// Case 1: Ace (A)
-test(`Should return 11 when given an ace card`, () => {
-  expect(getCardValue("A♠")).toEqual(11);
+  for (let rank = 2; rank <= 10; rank += 1) {
+    for (const suit of suits) {
+      expect(getCardValue(`${rank}${suit}`)).toEqual(rank);
+    }
+  }
 });
 
-// Suggestion: Group the remaining test data into these categories:
-//   Number Cards (2-10)
-//   Face Cards (J, Q, K)
-//   Invalid Cards
+test("Returns 10 for face cards", () => {
+  const suits = ["♠", "♥", "♦", "♣"];
 
-// To learn how to test whether a function throws an error as expected in Jest,
-// please refer to the Jest documentation:
-// https://jestjs.io/docs/expect#tothrowerror
+  for (const rank of ["J", "Q", "K"]) {
+    for (const suit of suits) {
+      expect(getCardValue(`${rank}${suit}`)).toEqual(10);
+    }
+  }
+});
+
+test("Returns 11 for aces", () => {
+  for (const suit of ["♠", "♥", "♦", "♣"]) {
+    expect(getCardValue(`A${suit}`)).toEqual(11);
+  }
+});
 
+test("Throws an error for invalid card formats", () => {
+  const invalidCards = [
+    "A",
+    "invalid",
+    "1♠",
+    "11♠",
+    "02♠",
+    "0x02♦",
+    "2.1♦",
+    "0002♦",
+    "2.5♠",
+    " 2♠",
+    "A?",
+    "",
+  ];
+
+  for (const card of invalidCards) {
+    expect(() => getCardValue(card)).toThrow(
+      `Expected a number followed by a suit, but got "${card}"`
+    );
+  }
+});