In order to take admission in IITs offered by (IIT Kharagpur & IIT Roorkee) You need to appear JEE Main Entrance Exam first after qualifying JEE Main Entrance Exam you need to apply for JEE Advance AAT for Architecture program. You can check the complete information about JEE Advance AAT with the given below link.
https://engineering.careers360.com/articles/jee-advanced-aat
Good Luck!
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