I have given all the exams of B.Com but I failed in 1 subject of 2nd year. Can I complete it in 1 year?

It depends on the rules and regulations of the university you are enrolled in. Generally, universities allow students to clear their backlog exams in the following year's examination cycle. However, you should check with your university's rules and regulations to confirm whether you can complete the

Yes, you can give all the exams in the final year to clear the current exam and backlogs.