It's how I learned it, not that I took a training class, but that I learned it after a class; That doesn't mean I can sit there and study. The key is to see the method and efficiency, and whether the time is really used.
Pay attention to summing up. Studying efficiently is still very tiring. Just listen to the training class. According to the teacher's rhythm, the brain is inactive, more comfortable and has little effect.
The above is personal experience, I hope it will help you.
I signed up for two places, and it was inconvenient for class. I ran back and forth and wasted a lot of time.