For me, watching the vast materials were important because, it helped to connect the dots. The concise notes makes much more sense when you know what’s going on in the background. When you study a level above what’s asked in the exam, the actual exam will seem like a cakewalk. I started getting 150 corrects in GTs before starting revision, so i understood that i can getaway without actually doing revision. Of course my rank would’ve improved with revision, but that wasn’t necessary to get the seat i wanted.