Generally speaking, it's ok. I am a junior college student this year, and I attend two students in our school at 288. The highest in our class is 305, and I got 8/10 in the exam. Good teachers generally have strict teaching management and attend classes every week, so they are also a constraint on themselves. This year's class (basic+sprint) 1800. Other training institutions want to have cheaper prices, you choose.

In addition, if the basic three subjects are good, you can only sign up for one punching class. If one of them is good, you can only apply for the whole course of two. For example, I only applied for the whole course of mathematics and computer, but I didn't apply for English, so I think the most important thing is that you should work harder in your junior year, and the training course is only an aid.

Another point is that I think a good teacher is professional enough to be fully used in undergraduate counseling. Of course, you can go to different training institutions for audition and make a comparison.

I hope my answer can help you.