Hello,
462 marks will definitely earn you a seat in government medical college under home state quota . Though getting a seat through entrance exams is always relative and depends upon the merit trend, question paper difficulty, number of applicants of that particular year . As NEET has been in question and been quashed and reenacted multiple times as far as I can remember. Judging it as an average question paper like previous years and other factors remaining constant 462 marks is pretty good marks to get a government medical college easily. Though you might get periferral colleges in the first councilling but I'm positive that in further councilling it would be upgraded. Kerala  has nearly 900 ++ seats in total.
Going with the previous year trends I'm sure that you'll be able to secure a seat.
For furthermore information please go through the link given below to predict the colleges you may get :
https://medicine.careers360.com/articles/neet-cutoff-kerala/amp
I hope this would help you. For further queries please feel free to write me down in the comment box.

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