I only managed 90%, but what annoyed me are some of the questions are ambiguous, such as the diesel/naturally aspirated question - answers "because the piston moving down sucks it in" and "atmospheric pressure pushing it in" are both technically the same thing - the piston going down creates a low pressure area, but if atmospheric pressure were not present to push the air in, the air wouldnt go in. Tough call on a couple of them.