Yeah, I never did that well on math standardized tests even though I did okay with math in general. The tests can be really broad. I'm not sure if you can find this info or not, but sometimes the testing authority will say that 10% is on this topic, 20% on that topic and it can be really helpful to figure out what you should study.

In your situation, I'd suggest studying with lots of practice tests, hopefully ones specific to the standardized test you are taking. I've also heard that your first 'guess' on a test has a greater chance of being right, so if you are torn between two answers, maybe go with the one you liked first? With the practice tests you could actually see if that's true for you and it might help figure out which answer you should choose.

Also, if you take tests where they subtract for wrong answers, strategically *not* answering questions can be a good idea.