Your brain is full of information on test day. These are the formulas that students most frequently forget under pressure.

1. The Quadratic Formula. Everyone thinks they know it, but they mix up the signs or forget the '2a' in the denominator.

2. The Slope Formula: (y₂ - y₁) / (x₂ - x₁). It's amazing how many students flip this upside down.

3. The Midpoint Formula: It's just the average of the x's and the average of the y's, but it's easy to forget.

4. The Distance Formula. This one is complex and easy to make a calculation error with.

5. The Vertex Form of a Parabola: y = a(x - h)² + k. Students often forget that the vertex is at (+h, k), not (-h, k).

6. The Exponent Rule for a Power to a Power: (xᵃ)ᵇ = xᵃᵇ. They often add instead of multiply.

7. The Difference of Squares: a² - b² = (a-b)(a+b). This factoring shortcut is a huge time-saver but is often missed.

How do you avoid forgetting? Don't just read them. Write them.

Create a 'master formula sheet' and practice writing it from memory every day for a week before the test. Lock it in.