Hi Milani
Paul has already provided a link. In general, SAP Training and Education site has all of the certifications. If you go there you can search for the code (there is also a professional security for P_AUDSEC_731 as well).
Once you bring up the certification details there is a link that will open up the learning map as well as related courses so you can see all of the ADM* courses you need to be across. ADM940 and ADM950 are probably two of the key ones.
As it's all SAP standard, if you are trying to self-study you would be able to get SAP Learning Hub Subscription and access all of the courses (it's what I'm doing at the moment to work through studying for the security certifications).
Regards
Colleen