Hello!

Yes, definitely a person with a BA degree in computer applications and pol science with science stream in class 12th can pursue mca.

You can apply for jnu mca exam as the eligibility criteria is as follows:

Bachelor's degree in 10+2+3 pattern with 55% minimum marks in bachelor's degree.

Other exams for mca are: NIMCET, iit jam, pune University mca entrance exam, ipu cet mca, bit mca. You are eligible for each of these national level exams. But criteria differs for each of them individually.

I hope this helps.