Hello student I'm sorry to inform you but as you mentioned you're from Goa, so you're not eligible for KCET. As per the nativity eligibility criteria - Candidates must have studied 7 years in any government or government recognized institutions located in Karnataka

Eligibility - Candidates must passed class 12 in any physics chemistry and mathematics from a recognized board.

For more details refer to the link mentioned below - https://www.google.com/amp/s/engineering.careers360.com/articles/kcet-eligibility-criteria/amp

Feel free to comment if you have any doubt

Good luck