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.)
Use the following links for each exam boards’ provisional results statistics and grade boundaries.
OCR Results Statistics & Grade Boundaries
UCAS – 2019 A Level Results Day
WJEC Unit Grade Boundaries (search on the unit required, note the option on the top right of the screen which for example enables you to choose higher or foundation at GCSE. Grade boundaries for the overall qualifications are available for WJEC centres from their secure site.)
WJEC Grade boundaries select the year, session and subject.
To do a finer analysis and look at individual module results and even marks for each question, centres can register with the appropriate examination board for their enhanced results services. To help your thinking have a look at the AQA’s Guide to AQA Enhanced Results Analysis and see also the #5MinuteResultsAnalysis by @LeadingLearner & @TeacherToolkit