How much paper does landscape rapid design usually use?

Generally speaking, landscape quick questions are made of sulfuric acid paper or milin paper. At present, domestic colleges and universities require the use of milin paper, which will not react with the color of marker. This is very important. Some marker pens and stylus pens will react as soon as they arrive on the drawing, especially sulfuric acid paper, which does not absorb ink and is transparent. It is suggested that as long as they can bring their own paper, they should bring milin paper. Now many schools like Tsinghua, China Construction and South China Institute of Technology require this paper to take the exam. Otherwise, the paper used by students is too messy, and don't use too thick paper, otherwise there will be creases, and the quick questions of foreign candidates will be folded into A3 envelopes. So why do many schools use Taoist paper for quick exams?

Tsinghua Beilin in Daolin