SQL

The requirement to become a data analyst is expertise in mathematics and statistics. In addition, you are advised to learn and become expert in one object oriented programming language and any RDBMS. After that, you may pursue PG Diploma in data analytics, where you can learn state of art data analytics tools and software packages.

PL/SQL course can be learned at home, if you already have some basic knowledge and experience in programming languages and SQL database. There are some good tutorial websites like Tutorials Point in which you can try and learn basic PL/SQL.
You must give a try by yourself first. This will help you a lot in industry which changes technologies frequently and your ability to adapt is the major criteria of success.

To learn web designing, you should first learn HTML.To learn software development languages, you should first learn C language.

Any additional load will impact your BCA degree. You are advised to first clear your backlog and obtain your BCA degree. You may evaluate short courses on Mobile computing or SAP programming to enhance your employability.