A problem faced by a lot of students while taking full length tests from different sources is that there are some practice tests that only give you percentiles for each section (and not the actual scaled score); then again there are some that give you only the scaled score but not the percentile. Use this table to get your scaled score from your percentiles and vice versa. Also get an idea of your final score out of 800 using your scaled score breakup.

GMAT Scoring Scale Conversion Matrix (10851)