Hello aspirant

hope you are doing well and safe. With reference to your query,  I would glad inform you that in the final year of BA ,and spending 2 crucial years of life , this decsision of changing stream should be taken after deep analysis and strong confidence . Scientifc field is very wide if you have very keen in interest in some domain of science like physics , chemistry ,computer science and have knowledge atleast about their fundamentals then only think about it rest stay on whatever you are doing and hardwork on it . Things automatically becomes passion if you get succeed in it

Hope you found this answer informative. Best wishes for your future