There are a variety of ways to prepare for Microsoft Certifications, including formal training provided by Microsoft Learning Partners, group study and self-learning and the approach each of us take will depend on our own personal situation.
As I don’t have a lot of free cash to pay for formal training, and I find it difficult to allocate large blocks of free time to anything outside of work and my family, my approach is almost always to pursue self-study although wherever possible I would join a study group if there were one that happened to be running for my topic of interest.
I always keep a look out for anything being run by Julian Sharp who is a Microsoft MVP (Most Valuable Professional) and MCT (Microsoft Certified Trainer). Julian regularly runs study groups on subjects across the Business Applications and Power Platform areas and they are exceptionally valuable for anyone hoping to pass those types of certifications.
On this occasion, there was no study group running when I started to prepare for the MB-210 so I knew I would have to get my head down and get on with the self-study.