If your mother have domicile certificate of Karnataka then you have to undergo Kannada Language test in order to be take admission in government colleges of Karnataka.

In order to be eligible make sure you should have scored at least 45 per cent aggregate marks in your class 12th. There is a relexation of marks for reserved category. 

You can also check the complete eligibility criteria from the given below link

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

Good Luck!!