BCA

The general eligibility criteria to be eligible for applying for BCA course you must have completed your Higher Secondary (+2) Examination equivalent (Diploma degree), with minimum 50% marks in total and also having Mathematics as subject in the qualifying examination. It is easy to get admission in BCA. You can get admission through entrance exams that are conducted by the various colleges and universities and you can also get admission through merit based. The minimum qualification for BCA is: You should passed +2 at least 60% (some colleges also offer admission at 50%). BCA Course Details
Course BCA Full form Bachelor of computer Applications Eligibility & Requirement 10+2 or equivalent Duration 3 years Fee Offered 1.5 Lacs INR to 6 Lacs INR for three years.

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.