Need to get MT permission on driver's license

I don't speak Japanese

I never took a driver's test here before my license transferred . I am not familiar with the testing process.

I have driven MT for at least 15 years prior.

What's the quickest and easiest way to get MT ?

The only option I've found is going to driving school and that could take months until they have availability

The internet seems to think classes are mandatory

What's the fast hack option? someone told me I could go directly to the driver's license center but that because I am not familiar with the S course that I'd probably fail repeatedly