Felix's Classroom Of The Elite

First of all, sorry for this jebait but I still think that I am a very inexperienced writer so I want to consult something important with you all. I know that I am writing in the MC's POV which quite suits me, however, there are times when I simply want to add side thoughts of other characters but making another POV for a few sentences doesn't make any sense and it would only take more words (even slower pace, yes it's hard to believe that it's still possible). So I want to ask you if I should keep the MC's POV which suits me and sometimes simply add side thoughts with '.....' and who was thinking to his POV. I am not entirely sure if it would look good so that's why I am asking. Or I could simply change it entirely and write it in my POV, therefore, I would have to write MC's thoughts into an inverted comma ' ' but I am not really confident with changing into this style of writing but I will do my best.

Please tell me your thoughts on this matter, I will leave two comments below this chapter "1st person with side thoughts"(MC's POV) and "Complete change into 3rd person". You can like one of these or if you have other ideas feel free to add them into comments