Your query is quite confusing. Let me make it clear that the course syllabus offered in BCA is more or less similar to those offered by DOEACC. Perhaps you may be aware that DOEACC is a Department under Minsitry of Information Technology, Govt. of India and conducts courses to promote professionalism in Computers and the courses offered are O, A,B,C levels.
BCA is a graduate level course in computer application and it is equivalent to A level course offered by DOEACC. After completion of B Com and BCA, you can opt for B level course which would be helpful for your career. I don't think any cases are their challenging the equivalency of the courses and you can understand the similarities and merits in these courses by visiting the official site. In fact, B Com and BCA is a good combo for career growth and you can have good job avenues in the field of Accountancy and auditing because of the knowledge in Computers.
Further, any graduate is eligible for the UDC post in a Government sector while 12th standard is the eligibility criterion for LDC/Clerk post. But these posts are filled by the respective State Public Service Commissions through a notified competitive examination based on the availability of vacancies every year.