Is Onsego legit?

Yes, Onsego is legit. Onsego offers online GED prep classes that are 100% aligned with the GED test. 

The GED test is provided by the GED Testing Service, and students schedule their tests at GED.com. 

GED.com includes Onsego, together with 19 other certified publishers, on the list of trusted prep programs that meet the GED test objectives and have a high level of instructional integrity.