National Maths GCSE grades 2020 (compared to 2019):

7+ 19.0% (15.9%)
4+ 66.6% (59.6%)
1+ 99.3% (97.7%)

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/910517/6673_GCSE-A-Level-results-tables-2020.xlsx

National Maths A level grades 2020 - the final confirmed grades (compared to 2019):

A* 23.4% (16.3%)
A or above 49.5% (40.5%)
B or above 69.8% (58.4%)
C or above 86.3% (75.1%)
D or above 95.3% (88.6%)
E or above 99.5% (96.8%)

Also worth comparing GCSE maths results for students in year 11 only:

2020 percentage (2019 percentage, 2018 percentage)
7+ 24.3% (20.4%, 20.0%)
4+ 77.2% (71.5%. 71.0%)
1+ 99.4% (98.2%, 98.1%)

Now here's a *very* significant change.

A level Further Maths - final results. 2020 percentage (2019 percentage)

A* 40.9% (24.0%)
A or above 71.1% (53.1%)
B or above 87.8% (73.2%)
C or above 95.9% (86.4%)
D or above 98.8% (94.2%)
E or above 99.8% (97.8%)