dear aspirant,hope you are doing weell.Now coming to  yor question, here is a list of the lateral entry seats for colleges in kerela that will give you an idea about the number of seats.

the link is:http://www.kea.kar.nic.in/pgcet_2017/mca_lateral_draft_final.pdf.

hope this will help.

for further queries related to this topic,feel free to post down in the comment section below.