Need guidance

i'm a class 12 science stream(non-med) student. I always wanted to become a ca but my parents wanted me to take up science .But after class 12, i want to pursue my dream. So how should i go about it? i mean i cant give the cpt now as  i dont have any idea about the commerce subjects. so should i do it after a b.com degree or should i appear for cpt next year december?

if bcom then which college?is du (srcc) still a good option even after fyup or is ip or st. xavier's kolkata a good option. Please help me anyone and everyone!!!THIS IS MY ULTIMATE DREAM