You have a very good marks so there are high chances of getting the govt. seat in MBBS in kerala if you apply through 85% state quota or through all india quota. For kerala the maximum rank for the govt. medical college is 6032 with the marks 558 in govt. medical college, Manjeri. So you can apply through state quota and you can get the seat in MBBS. I would suggeat you to go for MBBS than vaterinary course. It would be way easier for you to get the veterinary college through NEET. A link is given below where you can find the cutoff ranks for various govt. college in kerala and you will be having a better picture of the admission.

https://medicine.careers360.com/articles/neet-cutoff-kerala