BCA

Well, it totally depends upon you that in which field you have interest. There are multiple languages and courses which you can pursue to improve your CV while doing BCA. But don't miss the basics. First clear levels of C and C+ then you can learn:
HTML & CSS
Java
JAVASCRIPT
JQUERY
PYTHON
SQL (don't miss this)
C#
RUBY/RAILS
PHP
You can also pursue micro master courses on the big data. Big data is also in demand now days. You can take help of online learning as their are various websites which are made for learning the languages. Here is the link which will give you name of 10 websites which provide learning materials
Top 10 Websites to Learn Coding (Interactively) Online
Someof my favourites are
edX
Online Video Tutorials & Training
Khan Academy
W3Schools Online Web Tutorials
P. S - Prefer W3Schools, as it starts with very basics of every language :)
Thank you.

The general eligibility criteria to be eligible for applying for BCA course you must have completed your Higher Secondary (+2) examination or equivalent (Diploma degree), with a minimum of 50% marks in total and also having mathematics as a subject in the qualifying examination. Also, as I mentioned earlier the above criteria is generally observed in most institutions offering the BCA degree but some institutions might also drop the minimum % marks required to get admission in the BCA course. While a good number of colleges admit on basis of class XIIth marks but some reputed institutions conduct entrance test for admission to BCA course. Guru Gobind Singh Indra Prastha University (GGSIPU) conducts a combined entrance test for admission to BCA course.