1 There are many difficult competition questions. If you want special questions, you can buy those.

You can also buy a senior high school entrance examination paper like Tian Li 38. Although there are not so many problems, it is more practical, and the problems near the finale are similar. Our teacher shouted to buy this!

I think the last question of sailing recommended by our teacher is that kind of difficulty.

I am also a graduating class. The above is my opinion. I hope I can help you.