How many tests are sectional and how many are full-length?

There are 15 sectional tests (Tests 1 to 11 and 13 to 16) and 5 full-length tests. The full-length tests are Test 12 (Paper 1) as a mid-point benchmark, and Tests 17 to 20 in the final simulation, where Test 20 combines Paper 1 and Paper 2.