It's a metronome isn't it?

Nah I'm not here to correct the naming.
ANyways. You SHOULD use it, like it or not. That way you'll be pushed to follow the tempo. Especially when you play Ravel, you need to be precise in timing.
If you can't follow the metronome, I don't think you can manage to play very fast songs without "rushing".
You should try starting from 50% of the real speed if it's fast. If it's slow whatsoever, just practice slower... (I tried using 40 MM(Can't be lower

)for the first time I play 56 MM)