Hi Ram,
Its good to see you targeting one of the best IIT. But you have not mentioned your branch in which you would like to go. IIT Guwahti undertakes many engineering programmes and also know for the good placement.
As IIT Guwahti accepts the score of JEE and there is process of merit ranks for shortlisting students. The shortlisting is done by undertaking the different category you belonged. So here I am mentioning link of cut-offs of last 3-4 years by specific field rank and the caste category :
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-guwahati/amp&ved=2ahUKEwjQx_es-uvhAhWD7XMBHd7LDhsQFjAAegQIARAB&usg=AOvVaw3-dh_22yXGsk76E_VVvuqY&cf=1
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