It is best to take 12 classes continuously during the summer vacation. According to the relevant public information, if you learn to swim, it is best to do it continuously, and of course, you can do it every other day, but the interval should not be too long, because the formation of movements requires an inertia and takes a long time of practice to learn. If the interval is too long, it is easy to forget the movements you have learned before, so most swimming lessons end within half a month.