Hi,
It's great that you want to start preparing for CA exams from your second year in college but keep in mind that you should not burn yourself out while doing both these things.
We are nobody to tell you whether you can do something or not. If you think you can do it, then you can go for it. Try & see if you can handle both but see that your graduation process does not take a back seat as your graduation degree is important. CA preparation is very difficult as we all know so you can always try but if you are unable to do it, do not lose hope, you can wait till your graduation is over.
If you are a science student, then you will need a little more time to understand the concepts of accountancy & other things but with proper preparation, you can do well.
All the best.
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