Hi there,
For the MCAT purposes, please use 36 ATP/glucose (science changed years ago to be 32):
2 NADH (4 ATP in ETC) + 2 ATP for glycolysis. One ATP per NADH is used in transport (so, net 4 ATP, instead of the 6 that should have been made)
2 NADH (6 ATP in ETC) made in prep stage
2 GTP (2 ATP), 6 NADH (18 ATP in ETC), and 2 FADH2 (4 ATP in ETC) made in Krebs Cycle.
Hope that clears it up!