Mainly depends on the teacher's hands-on opportunities. Now there are many West Point schools in Beijing, such as Judehua Tianlan Mountain West Point. I suggest listening and practicing by myself. The online comments about Jude Huatian are quite famous. The school has a long history, good teachers, unified management and strict hygiene. You can audition first and then learn when you are satisfied. I think it's good. At least you won't feel bad after paying the fee, and then you can get a refund. And some schools will have money in their own pockets.