MCA Eligibility

Yes, you can easily get admission into Techno as you are already studying maths in your +2. You just need to make sure that you score atleast 50% in your +2 to be eligible for Techno. If you want to learn programming languages which you will be studying in your BCA course then you can check out this app which is specially designed and developed for BCA students. It has programs and assignments of languages like C, C+ and Java with their outputs. You'll be studying these languages in your 3 years of BCA. https://play.google.com/store/apps/details?id=technark.bca_courprogramming

Yes, you can go for MCA. Also, since you have done BCA, you can get lateral entry admission.

As you already have computer science as your major subject, so you are surely eligible for MCA lateral.

For admission in MCA at JNU, you need to have 55% in a Bachelor's degree in any discipline with adequate competence in Mathematics under 10+2+3 pattern of education.