Hi Ragavardini , 

                      You have secured a preety good score in jee mains 2018. As you are having an OBC-B category reservation so you will be getting preety good streams like CSE, ECE and ME in IIIT GWALIOR,IIIT jabalpur and the other IIIT's as well except the top notched IIIT like IIIT alahabad, IIIT hyderabad etc.

And if you are talking about NIT then there is hardly any chance of getting top-notched NIT like NIT trichi,NIT surathkal,NIT rourkela or NIT Warangal but you can get MNIT jaipur,NIT khurukhetra ,NIT hamirpur,with metallurgical,civil,bio tech engg and etc. You can also get a good stream in NIT Meghalaya and NIT manipur with good branches like ECE ME CSE if luck goes with you.

hope this helped you.Best of luck for your future.