Dear Asish Nayak,

You will probably get some new NIT, but there are low chances of getting top branches.JEE main cutoff marks may vary every year, but if we observe the trend for past 4-5 years, difficulty level of paper is increasing year by year, thus there is a slight fall (4-5 marks/even 10 marks) every year. I think this years cut off will be around 75-95.Also it is based on the following factors:

(I) Numbers of students appeared for the exam.

(Ii)Level of questions in the exam and the number of easy or medium level questions as hard level question are only for top rankers.

(Iii)Also depends on the bonus marks if any ambiguous question is there, which generally increases the cutoff marks.

You will be qualified for second paper, please visit college predictor to know which college you probably get with your score. 

The expected cutoff marks, rank predictor and college predictor for JEE main-2018 is shared below:

Https://engineering.careers360.com/articles/jee-main-cutoff

Https://engineering.careers360.com/jee-main-college-predictor

Https://engineering.careers360.com/jee-main-rank-predictor

You can also concentrate on other exams such as BITSAT and other exams also, but keep an eye on advanced topics also.

Hope you found this helpful..!!!

All the best...!!!