You can write KCET if you have domicile certificate of Karnataka or You are Ward of Defence Personnel in karnataka or Your Mother Tongue is Kannada. You can check the further eligibility with the given below link.

https://engineering.careers360.com/articles/kcet-eligibility-criteria

If you do not meet any of the criteria & wish to take admission in Karnataka then you can apply for COMED K UGET Entrance Exam, It is the exam for the prvate colleges of Karnataka.

Good Luck!