Having worked in this area for a while, I'm happy to recommend some reputable groups. Some of it depends on what you're looking for, though. Certain groups are more of a 'course' like Kaplan, which teach from a series of classes. Among those, PASS program is pretty helpful for many people.
There are a lot of reputable people in both groups, though. Kinda depends on your timeline and what you're looking for.
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