In this year like no other, follow news releases as they happen from Ofqual, DfE and the exam boards on Twitter, using this Examinations list. For Mathematics use this mini-list for AQA, Edexcel and OCR Maths & MEI Maths. (You can follow these lists without subscribing to Twitter.)
Eduqas Results Statistics (includes November 2020)
FFT Education Datalab
check their blog for the latest information: …
A-Level results 2020: The main trends in grades and entries
Also, note that all the latest figures are available to explore on Education Datalab’s results microsite.