Hello,
If your query is regarding the college that you have tagged that is college of engineering, Trivandrum then amidst the undergraduate courses it offers BTech and BArch for which admission is done through KEAM and NATA respectively which you can check out their official website by visiting the following link;
KEAM; cee.kerala.gov.in
NATA; http://www.nata.in/
The details pertaining to commencement of registration process will be available at the aforementioned site, for NATA it's already began from 5th March.
In case you want to know about KCET as from your profile it seems you're from Karnataka, then KCET application process hasn't commenced yet, you can stay updated at the official website at http://kea.kar.nic.in/ , chances are it might get released this month but there is no official confirmation for the same, you can also follow our page at https://engineering.careers360.com/articles/kcet-application-form
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