At first, you have to register yourself only, when registration will start.
Once you register yourself, then you have to verify your original documents at your nearest felicitations centre(due to covid-19 it can also be online) within the given time.
The process will continue same, also you don't need any fill colleges form separately. This will be totally online on your aicte portal login id.
I' ll share soon here full process of PMSSS from starting registration to uploading joining report that you will get from your college when selected.