Taxation

Yes, it is good for you, Taxation degrees use knowledge from areas such as economy, legislation, politics, public administration and international business. You can find jobs according to your educational background and working experience. You can work in different fields such as different government and private organizations, business banking sector, colleges, universities, economic companies, etc.
What Job Title Might I Have? Here we have listed some job titles of these fields:
Accountant
Tax Policy Analyst
Financial Analyst
Internal Auditors
External Auditors
Employment Tax Specialist
Personal Finance Consultant

You may visit this link
https://www.shiksha.com/law/course/post-graduate-diploma-in-taxation-law-the-maharaja-sayajirao-university-of-baroda-vadodara-180232

These are top 3 institutes best for Diploma in taxation in Pune:
ASM (CSIT) College of Commerce, Science and Information Technology
Arihant Group of Institutes
MS Institute of Management.

Yes, B.Tech IT students are applicable for this course.

If you want to get employed then join some CA firm practicing income tax and GST as an intern to learn taxation. There is a lot of scope in the field of GST laws and practice ( Learn as an intern with CA Instead of doing a Diploma). Instead of taking employment you may also pursue higher education say professional courses like LL.B. ( specialise in taxation) and CA etc.

Admission to KU via merit list counselling seems a challenge with 71% but don't lose hope and try to enquire for management quota seats to KU from student helpdesk by either calling them or dropping a mail to their forum.

Of course, yes you can apply for it.