As Leeds are not exactly transparent about their shortlisting, here is a summary for A level applicants.
Applications are scored out of 40, with 27 points for GCSEs/AS levels, 8 points for A levels and 5 points for BMAT. They are a bit vague about what they do with the PS, but it is not included in the points system.
The GCSE points are calculated for your 9 best including maths, english and science. 3 points for A*/9/8, 2 points for A/7, 1 point for B/6. They have confirmed this is unchanged for 2020 entry.
If you have done AS levels and have AAA, they give you the full 27 for that instead of the GCSE points.
You get 8 points for AAA A levels achieved/predicted.
The BMAT scores of all applicants are converted to a single score. I don't think anybody managed to work out quite how they convert it, but they say that sections 1 and 2 have double the weighting of section 3. I was told by Admissions that they do not use the letter in the score, but others got different responses. For 2019 5,5,3A got 5 points, so the threshold for top BMAT band was no higher than that and was probably a little lower.
For 2019 entry, regular (non-A2L) applicants needed 37 points - so 6A*s, 3As at GCSE, AAA at A level, top band BMAT was just enough for an interview. There will be more people with a high number of 8/9s this year as some of the old As would have been 8s, so there is a risk that people will need 38 points this year.