My JEE rank is 600000 can I get the NIT.

Please go with this college predictor. This will help you to choose the best college- https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor Thank you

No, it is not possible for you to get admission in any of the NITs with this rank. You can get only in less tier private colleges, to know in which colleges you are eligible to apply, use the college predictor tool. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.