grade boundary is 87%
if you go to the OCR website you can look at the mark scheme, A* is 173/200
However it's slightly different depending on what papers you do
for me I did Language 1, Virgil (Verse Literature) Language 2 (basically a harder language paper) and Prose Literature (Druids and Boudicca)
1952/21, 22, 23, 24
With other combinations it can vary, just check out the website