Dear Student,

You will get only two consecutive year to appear in the JEE advance and Three consecutive year for JEE mains. At your first chance will end by the time you passed your 12th, whether you have participated in the exam or not.

So if you take admission in any other course also preparing for the JEE at same time then you can do only one thing. every UG degree takes 3 year to complete and if you will go to complete your degree then you will loose your all JEE chance.

And if you want to take college after a drop if you got any then you need to left the degree you are currently pursuing in a legal way.

So it will be more better if you choose only one and yes you can take admission in any college while preparing but that will not help you.

good luck :)