BCA

You may pursue the same only after completing maths of 10+2 level if you have not studied maths at BCA level, for this you may opt NIOS on demand exam.

Hi,
As far my knowledge is concern that BCA or any other degree is not required for gaming. All games are programs in some languages like Java, C+, etc. So, if you have the complete knowledge about it and if you are good at programming in these fields then it will be easy to develop any game. As you told that you want to do BCA, if you do this and don't work in programming then it is not easy to develop any Game.
So, work in programming and develop your skills in programming. Then it will be easy to you to develop games.

Dear,
As per UGC guidelines, you can apply for 2 different programmes from 2 different universities in distance and regular mode education.
But choose the regular programme according to your career goal and interest.
All the best!

The question itself is illogical. Why would one again spend 3-years to pursue an undergraduate program after completing graduation? B.Sc mathematics doesn't have a great career except in the field of teaching so definitely it depends on what you want to do.

Kindly mention the city in which you want to study.

BCA is often regarded as the preparatory course for the MCA. MCA degree is a Master degree and therefore, provides a thorough knowledge of the subject in comparison to a BCA degree. BCA and MCA are both related to the courses pertaining to computer applications. BCA covers the subjects on an introductory basis. However, in MCA, in-depth knowledge of the subjects is provided. Career opportunities are also better with a MCA degree as it is a Masters degree. So, you must go for MCA after BCA.