Hello

Your question is not clear as such for what are you asking to study, your course , which subject, please mention it

English is a language which is usually needed when you are planning to go abroad or mostly text in colleges are in english. It is a global language known by everyone but it is not a mark of intelligence

Hindi is our national language , if you are comfortable in hindi you should speak that and you can always learn english by speaking in day to day life, reading books. Hindi or english it doesn't matter if you have good knowledge as you can learn english anytime.

Hope this helps