Hello, 

No, it is necessary to complete all the steps of Basic Registration in order to fill the Final Registration and it is necessary to upload all images  and documents.

These are some of the frequently asked questions. If you have queries like that, you can visit the FAQ link given below.

https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.aiimsexams.org/pdf/final%2520FAQ_%2520AIIMS%2520PG%2520July%25202018%2520sessioin%2520.pdf&ved=2ahUKEwjBw86J7oHfAhVKLo8KHe1SATQQFjAAegQIAxAB&usg=AOvVaw2Uy9167RWIjKAiWXd0zmAI

Hope this helps...