idk but my chem tutor was like cracked at chem i think he won like multiple olympiads and stuff and started teaching us stuff far from the cope which i don't mind but i didnt l like how he started teaching ahead before we even finished a topic iykim. like i dont see the point in learning extra things if u haven't gotten the basics covered. my phys tutor would talk for half of the lesson like have a full convo with the students and then speed run the content which was rlly fustrating.
i also didnt like how they monetised alot of things, like if u lose ur booklet u had to pay like 25 bucks for a new one, the calculator they give u isnt even nesa approved, if u didnt watch the video the first week u have to pay to rewatch it after like wth. my new tutoring center is like they release videos that were prerecorded so like the videos r higher quality compared to what zhangs had (record them as the class was happening) and u can rewatch them as much as u like, they also have a google drive filled with resources