In my point of view,long term is a topic which should be given a lot of time before you join.If you join long term and achieved a good rank then you feel happy but if things go wrong you will regret it. For your rank it's best to take a long term for JEE preparation as it gives sufficient time to complete the syllabus and you can Know the area where you are lagging.With your rank you might get a college but not the best one.So work hard and achieve your dreams.Wish you good luck.

yes ,everyone has the potential for everything if your environment is getting better you your self will be better so there is nothing like someone will be all the way very brilliant and you can't stand .

go for it and be consistant and it's right now high rank according to your talent but not high rank according to your potential

i'm providing you the link go with that predict the best possible college based on you rank and choose best among the best for your future. https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer