<p>When you reviewed those tests (blue book or other real tests I hope), could you figure out how to do those hard ones? At a minimum, you should learn how to “cherry-pick” – quickly identify problems that can be done by making up numbers and problems that match others you have understood in the past, like venn diagram problems or shifting a graph problems. The point is that there are themes that get repeated. The best way to learn those themes is to revisit actual tests and get yourself fluent. </p>