Hey there
If you come under ews then you will be benefitted with quota but you will not be considered for home state quota in Bihar and thus your home state will be Rajasthan.
Check the eligibility of JEE mains
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/jee-main-eligibility-criteria/amp&ved=2ahUKEwjMo-X2qf7kAhWJbX0KHdVmDaYQFjAAegQIBhAE&usg=AOvVaw0Ddf__yVIUe0laa-JjEit-&cf=1
Good luck
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