TEAS nursing

Hey, just had my first attempt for TEAS and got 81%, I wasn’t really preparing, cause I didn’t really figure which app or source is the best, I purchased ATI teas app and it were the same questions over and over, tried Quizlet but not sure if they are really good, what do you guys used to prepare? Also I see a lot of onlineteasprep app advertising, is it close to real teas or just a scam?