Yes. He reviewed every problem. Some of the math he simply didn’t know and wasn’t going to learn in time. So he learned to spot anything he wasn’t going to “win” and not waste time with it. He was also able to pick up speed, see common types of questions, and pick up tricks, etc.
Ironically, we found out later he has a significant gap in processing speed compared to all other parts of his brain but working like a mule for something he really wanted allowed him to conquer standardized testing.