Hi Veechi,
This is something that you have to decide on your own. If modelling is your ultimate career dream and you're sure of being successful in it, you can just go for modelling institutions in the country. The best of these would be in Mumbai and Delhi. They offer more of diploma and certificate courses in modelling. Or you can also go for a full time performing arts course which is available in few colleges.
However, if you want a backup plan you can always do a full time course you're interested in and then go on to pursue modelling. You can also study for diploma programme simultaneously with your normal college.
It is your call at the end.
Wish you all success!
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