Hi Nitin , 

You are not eligible for KCET & TNEA exams as you don't fulfill the basis eligibilty criteria as per the exam mentioned 

Please click on below link to have qucik view on same 

https://engineering.careers360.com/articles/kcet-eligibility-criteria 

https://engineering.careers360.com/articles/tnea-eligibility-criteria

Hope this helps

Please revert if looking for other helps in college etc 

Thanks 

Best of luck