Hello Arnold,

You can write a supplementary examination, if you have failed 3 of your subjects in a total of 6.  But, you may not be able to apply for any admissions further admission processes are available upon passing all the subjects only.

To avoid further failure in exams, practice more.  If you need further assistance or preparation tips, click on the link below:

https://school.careers360.com/exams/karnataka-puc-board

Hope that helps.  All the best.