I am failed in bsc part 1 (UG)with three subjects.what should I do ?
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!
I hope my answer have helped you and hope you do well in future.