1st in almost everything - clear 1st in multiple units possibly.
At a rank 22-ish school, a 99.95 was: 1st and state rank Chemistry, 1st and state rank Biology, 1st Modern, 2/3 in both 3U + 4U Maths and top 10 English.
While at a top 5 school, a 99.95 was: 2nd Phys, 3rd Chem, Top 7-8 3U + 4U...