Use all the information in a problem.
That's it -- that's the whole tip. In the SAT and the PSAT, there is no extra information in math problems. So if you solve the problem without using the fact that AB is congruent to BC or the fact that ABCD is a square, then you've got the wrong answer. You need to use all the information.
One way to be sure that you are using all the information is to cross out pieces as you use them. As you use each piece of information in your calculations, go back to the problem and softly cross out the information. (You don't want the word to be unreadable, in case you come back to the problem....)
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