Dear Aspirant,

You cannot improve your 12th marks if you haven't applied for improvement in the passing year of your plus two. You cannot apply for improvement exam after the passing year. So if you are in final or prefinal year of your Btech, then you have no option to change your 12th marks.

I suggest you should more importantly Focus on your studies in BTech and your project work and skill set.

That will lend you a job for sure.

Hope this helps. Thanks.