I've said this many times before but I'll say it again. If you don't have the score you want, then you are not done with OG. You didn't learn what you needed to learn the first time around. You need to go through them again.

Most of your learning does NOT come in the 2 minutes you spend doing a problem for the first time. Some learning, yes - but most comes from the analysis you do after you've finished the problem that first time. And that goes for problems you get right, too, not just the ones you got wrong.

If you got it right, did you get it right for the right reasons? If you got lucky, review all of the "wrong answer" questions, below. If you did know what you were doing, did you also do it in the best way (for you)? If not, figure out the best way for you. Also ask yourself how you will recognize problems of similar type in future so that you can either repeat your original success or apply your new "best way" to the problem.

If you got it wrong (or got it right for the wrong reasons), ask yourself:
- Why did I get it wrong (as specifically as possible)?
- What could I do to minimize the chance of making that error (or those errors) again? How will I make whatever that is a habit so that I really do minimize chances of making the same error again?
- What are the right ways to do it? (for math, there's always more than one way to do a problem)
- Of the right ways, which one is the best way for me (combining both efficiency and effectiveness) given my strengths and weaknesses?
- How will I recognize problems of similar type in future so that I can apply that "best way" to the problem?

You can easily spend 4-10 minutes (sometimes longer!) going over one problem, AFTER you've done it in the first place. And that's really where the majority of your learning comes.

Also I just want to stress: OG is the real thing. Nothing else is (even the sets, which do contain real past questions, come from the old paper and pencil tests, and things have changed since then). Don't move on to other sources when you haven't learned what you could be learning from the real thing.