Pranay@tutree explained the concepts of rotational inertia and energy to me in about 10 mins. I got more out of those 10 mins than the entire lecture on the subject from my professor.
Ever since I started studying somewhat regularly with Tutree tutors, my quiz grades have gone from 75 to 90 and now 100!!!! Tutree is wonderful, useful, flexible, lets me get a tutor in minutes which is SO convenient!
Tutree is awesome. The most useful on-demand service ever! Before using Tutree I got a C on my first midterm because its hard to get a tutor; after getting help from John@tutree I got an A in my physics class! The physics class was the third in a series at UCLA. Highly recommend him.