Hello.,

For getting admission into the IIT you need to write national level entrance exam i.e., JEE Mains and also you should get a suitable rank for getting the admission.

Yes ., The admission into other IIT involves the same procedure as after getting your AIQ rank if you are fitting into particular IIT then you have to register from the official website of the IIT. Then you have to wait for the admission process to begin. After checking through all of your details you will get admission into your desired IIT.

If any quieres do let me know in the comments. All the best