Hello Aspirant!

Do not get disheartened with your results. One result cannot decide the course of your life.
What you can do now is either repeat the year or take fresh admissions  (if the admission process for 1st year UG is still not closed ). Both the options are more or less the same. There is no harm in repeating a year. You are not going to be late or anything. Study well this time. Work on your weaknesses and start studying early.
Don't hesitate to ask if you have anymore doubts.
All the best!

You can rewrite the exam again after clearing the first year which means you can rewrite them in the second year. Since you have failed in three subjects you need to atleast pass the half of the exams of your first year to get promoted to next class because it is a mandatory thing. As the universities follow the CBCS pattern which says you will complete your graduation no matter what.
I hope my answer have helped you and hope you do well in future.