NIT

Since the cutoff of CSE branch is more than other branches so to get it in NIT is not possible but you could take any other branches to get into NITs and if you'll work hard in first year then you'll definitely be upgraded to higher branches like CSE based on your performance.

You may get till last round of counselling.

Hello,
I hope you are doing well. Yes definitely you can definitely get any IIIT or NIT with your 5K ranking of JEE Mains. For your reference I am attaching a link where you can find the list of NIT and IIIT you will get based on your ranking:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=7489993

Fill IIST's form before 5 junk and you will definitely get that college. You can go for ISCR too and do counselling till last round so you can get IIT, Dhanbad too.

https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Please follow the above mentioned link.

Hello Dharma,
As per your sister's marks in JEE Mains it's impossible for her to get any NIT's, so I will suggest you to look forward for any decent private colleges. Please check here:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Check here which NIT and branch could you get:
https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor&ved=2ahUKEwjUpLbay7bbAhUR448KHeU8DUkQFjAAegQICRAB&usg=AOvVaw1N9BzFtyUCP4JU-2UQHQ0H

According to your marks it is difficult to get admission in NITs. But don't lose hope, apply for some other good private colleges.

It is not possible that you can get admission in NITs but don't lose hope. There are also some good private colleges so you can go for them.

My friend got 187 marks in JEE Mains 2017, which I think are approximately equal to your score in JEE Mains 2018. He was not able to make it to IIIT-Bangalore. Last year's cutoff was 190 marks and cutoff marks of IIIT-Bangalore is increasing every year. Therefore, there are less chances for you to get into it. But, do not worry, there are endless chances and opportunities waiting for you ahead. Best of Luck.