Best Predictor for CARS (aside from AAMC)?

Hello~! ^_^ I've been working on CARS and have been seeing my score fluctuate from 60% to 80%. the AAMC sample test and scored test are widely known to be the most representative and great predictors but i want to know how i'm currently doing for cars so i can improve before taking the aamc tests. What material is considered the best predictor for CARS (aside from aamc FLs)?

Would the CARS Q packs or old AAMC VR material be good indicators?? How much can I trust others like khan academy,...

Best Predictor for CARS (aside from AAMC)?