Degree

Yes, you can do Diploma or degree courses in mass communication after a degree in B.Tech. There are the following degree courses that you can do after a B.Tech degree:
1. Master of Arts in Journalism & Mass Communication
2. Master of Journalism and Mass Communication
3. Master of Communication & Journalism
You can do the following Diploma course after your degree in B.Tech:
1. PG Diploma in Journalism and Mass Communication
2. PG Diploma in Mass Communication
You can take these courses at the following colleges:
1. Indian Institute of Mass Communication
2. Apeejay Institute of Mass Communication
3. Manav Rachna International Institute of Research and Studies
4. Indira Gandhi National Open University
5. Jadavpur University.

No, unlike a popular misconception, the B.Com degree is not compulsory if you want to become a CA. The CA is a professional course like the MBA. After completing the 12th grade, you can enroll in this course through the CPT route. If you are looking to do CA after graduation, you must have a degree by the time you apply for the CA Intermediate. You can apply with any degree, like B.Sc. Or B.A. To pursue the CA course. The B.Com is typically recommended because it is relevant for the CA programme. You will learn the fundamentals of commerce and accounting in B.Com which will also be covered in your CA course. Hence, you can prefer it if you are not enrolled in any other degree; otherwise, you can pursue CA with any Bachelor's degree.

You don't need to attend college every day, there are many people who prepare for competitive exams like UPSC with their college degree, You can apply at any college which do not require you to attend classes everyday like at IGNOU kind of open UNIVERSITY) here, you don't require to attend classes everyday but you have to give exams only, Many institutions provides courses in distance mode which even working person can apply for. You may choose any college as per your convenience
in your nearby places where you can complete your
Degree and for exams of college you don't require to study too much because UPSE is tougher than college exams so you would easily pass the exam. Best wishes.