How many tests are in the series and how are they divided?
There are 24 tests: 16 sectional and 8 full-length. GS-1 has 4 sectional and 2 full-length tests, GS-2 and GS-3 have 5 sectional and 2 full-length tests each, and GS-4 has 2 sectional and 2 full-length tests.