You are about to complete your CS executive course along with a BA by middle of next year. The CS certification itself is a good one to help you in getting a job placement .
Since you are keen to do another qualification but have a time commitment of one year. Then you need to focus of 6 monthly course. There would be many options but it would be sensible to narrow it down the areas that are your core strength or areas that you have an aptitude to excel. You may have a flair for industrial law, company mergers and demergers or the equity market. Once you earmark a few areas, then you can try and see if you can find a course that would enable you CV to be better with a 6 month course certification.
You can consider a Certificate course in corporate social responsibility, consumer protection law, investment management or even a diploma in equity research.
Please check out the IGNOU website, where in the school of law offers certicate courses
in Human Rights (CHR),Consumer Protection (CCP),International Humanitarian Law (CIHL )
Anti Human Trafficking (CAHT),Co-operation, Co-operative Law (CCLBL)
http://www.ignou.ac.in/ignou/aboutignou/school/sol/programmes/detail/37/2 (Cyber Law)
http://www.ignou.ac.in/ignou/aboutignou/school/soms/programmes/detail/201/2 (NGO management)
Ignou also offers a Post Graduate Diploma in International Business Operations (PGDIBO)
National stock exchange also offers some short term courses, you can look into if you have a passion for portfolio management etc. https://www.ncfm-india.com/ORE/CEPM/
I would suggest register on forums where in you can discuss with people in a similar stage (https://www.caclubindia.com/forum/)
Do one 6 month course, get a job and then why not think about pursuing a proper PG degree in Law, then you would have a better idea as to what would help you in career progression. Good Luck.