As being you hv category I think  u can get NIT Sikkim ,Agartala,new iiits means nits low on d list u can go for . Definitely u can seek a seat there either in chemical or in some nits such as not calcium there are several dual degree programs u can also search for that

sorry dear. low chances on NIT. With the jee mark and state board mark you can join a good Private college. never lose hope.all the best.