Sure! You may always re-take admission in any engineering college after leaving your current engineering college after your first year, and the same is with KCET counselling. Just make sure that you are still within the specified age range as this point may be a crucial one.

Further, I'll suggest you that first let the counselling happen and see what college and branch is allotted to you, then think of making any decision, as then you'll be able to make an informed choice without coming under any pressure.

Hope I have answered your question. All the best!