* The specific exam: Different entrance exams have different numbers of seats and varying difficulty levels. A rank of 422 might be excellent for one exam and not good enough for another.
* The branch and IIT: Top IITs and popular branches (like Computer Science, Electrical Engineering, Mechanical Engineering) are extremely competitive. A rank of 422 might get you into a less popular branch at a top IIT, or a more popular branch at a lower-ranked IIT. It's unlikely to guarantee admission to the most sought-after programs at the most prestigious IITs.
* Category: Reservations for different categories (like Scheduled Castes, Scheduled Tribes, Other Backward Classes) affect the cutoffs significantly. A rank of 422 might be sufficient for admission in a reserved category but not in the general category.
* Year-to-year variations: Cutoff ranks fluctuate from year to year depending on the difficulty of the exam and the number of applicants.
In short, a rank of 422 gives you a reasonable chance of getting into an IIT, but it's not a guarantee. You'll need to check the previous years' cutoff ranks for the specific IITs and branches you're interested in to get a better idea of your chances.