hi Abdul,

If you want to earn early in your life you can go B.Tech. You might have heard that everyone is doing B.Tech. and avg. package is 2-3LPA. You just need to get a good engineering college with good branch like(cse,ece,ee,it) in India i.e. tier-1 colleges like IITs/NITs/IIITs/BITS/DTU etc. After this you will be able to get 15-25 LPA CTC easily at the age of 21/22. And when start your career with this kind of package you will be getting a pretty good salary after 5-6 years of experiiecne. As  you have Biology in  12th you can also go for MBBS if you want, doctors also earn a steady good income  specially after 7-8 year of experience. ONE thing for sure whichever course you will choose, please choose the top-notch college for that course so that you will get the best peer group(very important) possible.

I hope this answer will help.
All the best for the future!!