well, i dont know many things about subjects, and high school and all.. 😛.. but i think ur worries are focusing more on social matters of class change 😊
if u want to study medicine, the most reasonable thing is to shift in a school where there are more faccilities to study it. That wud be a proffessional view.
But we always end to think about the ppl there, so i dont blame u. its just natural.
Well, about the teachers, is very very easy, just be urself, bcz that will help u and them aswell. i wud recommend u not to give fake appearances, bcz in situations of needed help, that only wud bring troubles. trust me, i have changed school like 4 times, and many times i thought about having another personality instead of the "boring" one i have. but it never worked, bcz i just ended to be myself, lol.. so i dont think u will have many opportunities of changing urself along wid changing the school....
About the diversity of cultures, it wont be a problem if u are a social person, and making friends for u is easy or not complicated.
first i thought u were living in India, but after knowing that u are in an european country, i think that things must be similar to here; where im the only indian in class, (actually the only in the whole school) 5 - 6 persons are muslims, and the rest all christians, beleiver or not. and well, if i talk about friends, mixing classes, in a group of 10 girls, like half of them are muslims, umight be wondering why do i talk about myself 😆.. lol, but as im not an expert in advices, and i live quite well in that situation, i thought of sharing my experience. 😊 i hope it helped..
so, concluding, i dont think i might have many difficulties. 😊