Hello...

Yes it is necessary to join mess in college itself because mess will be attached with your hostel building only and you have to take your food by sitting in dining only.

Also for non-veg lover people expect eggs anything is prohibited in campus so be aware of that.

You can see details about your college here:-https://dqxeclau.top/colleges/amrita-school-of-engineering-bengaluru

For further queries feel free to comment.