JEE Main Scores

If you are from general category, I would not suggest you to wait as chances are least, try to get better college with the other examination that you have given. Explore all the possibilities and make best out of it.
All the best.

If you aren't of general category then you are qualified other wise you have to look for private college if don't want to drop a year. You have to qualify for one entrance exam in getting the admission. There are many college which admission on basis of 12 % like LPU, UPES, ICFAI and many other private college. Civil engineering is very good branch who has scope in government and private sector. For taking admission in government you must qualify for JEE MAIN exam with high marks. If you think that dropping a year will benefit to you in preparing for JEE main then go for it otherwise choose BITS, SRM, KIIT, UPES etc.
Best of luck.

Yes, you will get a cut-off probably around 100.

Hello,
I hope you are doing well. You can check the list of college including NITs and IIITs, you can get according to your marks and rank here.
Use Shiksha JEE College Predictor:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=7489993.

Yes, you can apply but there are low chances for selection (If you are from general category). Hope for the best. You can surely apply. For applying to NIT you have to register yourself at JOSSA site. And fill up your respective NIT and branch you are interested in.

Hello, hope you are doing well. You can check the list of college including NIT and IIIT's you can get according to your marks and rank here. Use Shiksha JEE College Predictor: https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=7489993.

JEE Mains 2018 College Predictor
Use your JEE Mains 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of JEE Mains 2017
Get resources & insights on colleges & courses
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

Hello, hope you are doing well. You can check the list of college including NIT and IIIT's you can get according to your marks and rank here. Use Shiksha JEE College Predictor: https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=7489993.

Hello,
You can check the list of college including NITs and IIITs, you can get according to your marks and rank here. Use Shiksha JEE College Predictorhttps://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=7489993.

You have a very less chance of getting a seat in NIT.
But, you may have credibility of getting a seat into IIIT.