20%。 The postgraduate re-examination in Tsinghua University adopts the difference re-examination, that is, if the admission quota is 10, the former candidates from 12 to 13 will take part in the re-examination. As long as you enter the postgraduate entrance examination in Tsinghua University, the probability of being brushed is 20%, that is, the people with the last two or three total scores will be eliminated.