Hello Akash
You have a fair chance to get admission in nit surathkal with home state quota in civil engineering; mettalergicul and materials engineering ; mining engineering and some chances for chemical engineering also according to previous years trends.( Considering your 20000 rank.)
Ews category is included first time ; we don't have much information about it .
But you have chance to get other branches also with this category rank. So take part in couseling and fill your choices wisely and carefully.
https://engineering.careers360.com/articles/jee-main-cutoff-for-nit-surathkal/amp
Here you can see last year cut offs .
Good luck.

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