Whats is PSAT?i mean,i knw what SAT is...but psat?

The PSAT allows you to compete for a special scholarship based on how well you score on it, using a similar format to the SAT. The purpose is to get high school students prepared for the real test of course. I would take it in order to compete for the scholarship and see what your strengths, weaknesses are. Your high school counselor should know more about the scholarship, its a nationally competed scholarship.