To find your CET percentage for Computer or Electronics Engineering, you can use this simple method:

CET percentage = (your marks ÷ total marks) × 100

For example, if CET is for 200 marks and you got 120 marks, then
percentage = (120 ÷ 200) × 100 = 60 percent

This percentage helps colleges decide who gets admission into Computer or Electronics branches.

If you are asking how much percentage is needed to get a seat in these courses:

For government colleges, you usually need above 85 percent.
For private colleges, you may get a seat even with 60 to 80 percent, depending on your category and college.

You can check CET info and cutoffs on these websites:
https://cetonline.karnataka.gov.in