Unfortunately, there's no direct conversion formula to calculate the exact percentage from a CGPA in the Telangana SSC system.

The Telangana State Board of Secondary Education (TSBSE) follows a grading system where a CGPA of 9 would typically indicate an excellent performance. However, determining the exact percentage equivalent is not straightforward.

For CAT registration, you can enter your CGPA directly. Most entrance exams accept CGPA scores. However, if the system specifically asks for a percentage, you can mention your CGPA and add a note clarifying that it's the Telangana SSC grading system.

It's always a good practice to keep a copy of your SSC mark sheet for reference.