I have cleared AEM Architect certification during Mar 2020. Below are some of the critical topics to be prepared. Most of the questions are scenario based only. If you have hands-on experience in AEM 6.x for atleast 2-3 years with the below topics prepared, then you will be able to clear the certification.
URL to learn
Dispatcher - Caching concept - Auto invalidation - statfile
@sunitac93243435 Just go through all the topics covered in https://helpx.adobe.com/support/experience-manager/6-4.html. Believe me, It is the only genuine and best study material to clear all the Adobe exams. also, one thing I would like to share, daily practice and real-world problems occurred in ongoing projects will help you achieve any kind of Adobe expert certification whether its dev, lead, DevOps or architect.