With 266 marks in your PCM board exam and an expected KCET score of 90, your chances of getting admission into a good engineering college in Karnataka are quite good. Generally, a combined strong academic performance and decent KCET score improve your ranking in the counselling process.

Your admission depends on the cutoffs for the specific branch and college you choose. Popular branches like Computer Science or Electronics may have higher cutoffs, while other branches may be more accessible. It’s advisable to participate actively in counselling, fill your choices wisely, and keep backup options ready.

Overall, your marks put you in a competitive position for many reputable engineering colleges in Karnataka.