But if you make a one-on-one appointment with the teacher, you will be divided. Some teachers are not very good, so they say they are good, while others are not bad and have a sense of responsibility. Worry-free is 1 to 1. You can still get something by spending a lot of money, but you should keep your eyes open. Some teachers are still suspected of wasting time. If you are not short of money, you can report no worries. If you really work hard for a year, it is generally ok. Before I studied advanced mathematics, I met some teachers who gave you a question and ran out for a long time, while some teachers watched you do it.