hi
I think this may be website error or your device error. for confirmation you can clear your broswer history and capcha. Try that page.
If your are still not able to proceed on the page than you can contact on aiims examination
Https://www.aiimsexams.org/info/ContactUs.html
Result | Eligibility | Application | Exam Pattern | Admit Card | Preparation Tips | Cutoff
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile