im pursuing my 4th sem bca apart from this regular course is there any other necessary course i can do as an additional qualification,

Hi Kaushik, As such there are many certifications related to IT that you can opt for but then it entirely depends as to which specialization you would like to up as your career path like Hardware Networking, Software, Testing, Database etc. You can always look into your interest and your capability

Kaushik...I will strongly advice you to concentrate only on BCA and don't think about other courses AT THIS STAGE. Work hard and try to get a first class degree. BCA is your first stepping stone and you shoud put your best effort into it. You should think about doing additional courses (if necessary