I wouldn't start with other questions until you've actually reviewed the ones you've done. You've learned almost nothing compared to what you could have learned!
Keep an error log and write down precisely why you get any problem wrong. Then figure out how you can change your methods or institute new habits in such a way that you will minimize the chances of repeating that type of error in the future.
Don't forget that, sometimes, what you will need to decide is, "This problem is out of my reach. My best approach is to make an educated guess and move on." Then figure out how to do that.
For the ones you get wrong, answer these questions:
1) Why did I get it wrong (as specifically as possible)?
2) 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?
3) What are the right ways to do it? (for math, there's always more than one way to do a problem)
4) Of the right ways, which one is the best way for me (combining both efficiency and effectiveness) given my strengths and weaknesses?
5) How will I recognize problems of similar type in future so that I can apply that "best way" to the problem?
For ones you get right:
1) Did I really know what I was doing or did I get lucky? If I got lucky, review all of the "wrong answer" questions, above
2) If I did know what I was doing, did I also do it in the best way (for me)? If not, figure out the best way for you.
3) How will I recognize problems of similar type in future so that I can either repeat my original success or apply my new "best way" to the problem?
Also, for any question (right or wrong), answer these questions:
Did I make a connection to previous experience? Or did I have to do it all from scratch?
Did I choose the best approach?
Am I comfortable with other approaches that would have worked, at least partially? How should I have made an educated guess?
Do I understand every trap and trick that the writer built into the question, including why the wrong answers are wrong (especially on verbal)?
Could I explain every aspect of this problem, fully, to someone else?
How will I RECOGNIZE similar problems in the future? This is the "holy grail" of test prep.
The above is in addition, of course, to the obvious stuff - if you didn't know a rule or formula, if you didn't know what you were supposed to do to answer a certain type of question, etc, then go study that stuff.
