A+5%，A20%，B+25%，B25%，C+20%，C5%。 According to the news released by Shenzhen Education Bureau, in 2020, the mathematics scores of the senior high school entrance examination in Shenzhen were A+5%, A 20%, B+25%, B25%, C+20% and C5%. In the special case that the number of full marks exceeded 5% of the total number of candidates, all the full marks were A+, and the proportion of subsequent scores was deducted accordingly.