What are my options with jee main rank 18900?
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As per your rank in jEE mains you do have chances for getting a decent NIT.
Also, you can try for other good college like BITS,VIT.
But definitely as you have secured 18900 rank in jEE main so you won't be able to get best/top NITs like NOT trichy,NIT raurkela, NIT suratkhal,NIT Warangel.
However you might get some decent NITs.
Here, try for the JEE mains college predictor to know which college suits you best according to your rank
https://engineering.careers360.com/jee-main-college-predictor
JEE Main 2025 College Predictor
Know your college admission chances in NITs, IIITs and CFTIs, many States/ Institutes based on your JEE Main result by using JEE Main 2025 College Predictor.