His pencil scratched frantically against the paper. He was running calculations. $\cos 110$ was negative. He had to be careful with the signs. The numbers were ugly, but they were working.

He looked around. To his left, his classmate, the prodigy named Kevin, was already shading his answer sheet with the satisfied air of someone finishing a crossword puzzle. To his right, Sarah had her head in her hands.

If you tell me (Cambridge, Edexcel, local syllabus) and which topics feel hardest, I can give you specific practice questions or step-by-step worked examples.

Wait. He didn't have the other angle. He needed the Cosine Rule first? Or was it the Sine Rule?

Trying to solve both sides of the "Prove that..." equation at once.

And there, sitting at Question 11, was the boss battle. A Trigonometry problem involving a diagram of a trapezium inside a circle.

Panic, cold and sharp, bloomed in his chest. He looked at the clock. 3:40 PM.