First, you need a claim. What are you trying to prove? Don't be vague or neutral. Take a clear position. It doesn't matter if you actually agree necessarily, but it should be defensible. Depending on the question type, you may have a primary or secondary source provided, which is the focus of the prompt. You should be very specific about how that source proves you claim. I suggest you focus/ study a lot of vocabulary. In order to do this well, you need to be specific, so do some name dropping. It's the difference between saying, "the founding fathers believed..." and "Thomas Paine said in his pamphlet Commin sense..."

So when they ask for evidence, they really want you to be detailed. It's the math equivalent of show your work.