As per the official website, the educational eligibility for LLM is:

Bachelor’s Degree in Law, from any recognized University/Institution with minimum 50% marks in aggregate or equivalent grade (5% relaxation to SC/ST/OBC – Non Creamy Layer).

Now in the selection process its written that the admission will be based on the performance in the previous examination which is followed by a personal Interview. There are no such mentions of CLAT PG thus if you won't filled the application then you don't need to worry.

For official website visit the link below:

https://rgu.ac/llm.php

To know more about the college visit the link below:

https://www.careers360.com/university/royal-global-university-guwahati

I hope this answer helps. All the very best for your future endeavors!