For UPSC you need to have your Bachelors degree. Now if you don't go to your college then there can issues with your attendance and this may result into ineligibility to sit for your final examination. As a result, I would recommend you that don't stop going to the college, instead go for 3 days to the college and remaining 4 days study. In college try to study if possible or take rest in such a manner that when you return you can concentrate on your studies. This way you can complete your final year.

To know more about UPSC preparation visit the link below:

https://competition.careers360.com/articles/how-prepare-for-upsc-ias

I hope this answer helps. All the very best for your future endeavors!