The topics covered under the Oracle E-Business Suite (R12.2) Upgrade from K21 Academy is one the best out there. The topics cover all the relevant knowledge areas needed to transition into EBS R122.
I have been Apps DBA for over 15 years now and can tell you R122 presents a new learning curve from architecture to day to day DBA maintenance tasks and this is when K21 Academy comes in with their concise and crisp training with very knowledgeable instructors and support team.
The hands on include an actual upgrade to R12.2.4 using your own dedicated instance. The support team was awesome and always there to help resolve issues throughout the upgrade process. For anybody wanting to catch up quickly with EBS R122 upgrade and maintenance, this training will be ideal and appropriate and for the price, K21 Academy wins hands down and have recommended to all my colleagues and DBA friends.