Normally in 12th we take external coaching to get help case specifically in PCM, how we do when Banasthali
Hello Shailesh, if you don't afford coaching due to financial reason or lack of resources, you have other option too as you know due to jio reliance the cost of Internet package goes down, through the internet you can learn easily and it is very cost effective, there are a lot of videos available on youtube and many other online website which provide lots of free education material.
All the best





