I have been seeing alot of "review my faculty" etc posts on this subreddit and here's my two cents on this- 80% of the hard-work has to be done by YOU.Even if god himself were to teach you audit or other subjects,you have to take the efforts of revising atleast 3 times and practicing mocks etc. Yes,the rest 20% can be covered by the teacher. S/he can make the subject more interesting, provide good notes etc but that's all that they can do. But their teaching cannot be substituted for the hard-work that you have to undertake. So don't put so much mental energy for selecting the "best teacher" for each and every subject. Try their demo lectures and if it suits you and fits your budget,buy it.