Is there any option for undergrauate to write direct final year bcom exams?

No, there is generally no option for an undergraduate to write only the final year B.Com exams without completing the previous years of study. University regulations require students to complete all the coursework and examinations for each year of the B.Com program before being eligible to sit for the final year exams. There might be extremely rare exceptions in exceptional circumstances (e.g., proven transfer credits from another accredited institution covering prior years' work), but these are highly unusual and would require specific approval from the university.