Dear aspirant

I hope you are doing good . Answer to query can be given by self-analysis only because it varies from person to person . Try to analyse small piece of works in your 10+2 , try to spend time in computer lab work over there and make c programs , Try to go in physics labs and work on semiconductors ,Integrated circuits . Side by side in physics , to try to studies the internal working of machines .After working for sometime or 6 months ,try to analayse which field you were most comfortable too and founds to be fascinating . The result will be the answer to your query.

Hope you found this answer helpful. Good luck