As long as your son meets the eligibility criteria, he can appear for KCET 2021. That should not be a problem. To be eligible for KCET, he should have completed his 12th with Mathematics and Physics as his core subjects along with Chemistry/Biology/Biotechnology/Electonics/Computers as an additional subject. He should have secured a minimum aggregate of 45% in these 3 subjects. It is 45% for General Category and 40% for SC,ST,OBC. As long as he fulfils this criteria, he can appear for KCET 2021. For complete information, please visit our page: https://engineering.careers360.com/articles/kcet-eligibility-criteria