another review session and a some long(ish) hood time coming

i had another ground review session today (weight/balance/performance, aircraft systems). i also discovered that i need some more hood time (flying using only instruments by wearing a vision obstructing device on your head) before i can do my stage-3 check (and then the faa practical test). i was relatively ready for the session today but it doesn't take too many questions from someone that really does know the cessna 172 to make me realize i've got to hit the POH (pilot's operating handbook) again. for example:

• what type of engine does it have? (4 cylinder opposable internal combustion)
• if the air filter becomes obstructed what happens? (a door opens automatically and air comes in via the cowling)
• how many vacuum pumps does it have? (2)
• if a brake cylinder on the pilot's side fails, can the right seat use the brakes? (yes, this is potentially not true in the diamond da-20)

i had read all of the above in the POH but clearly had not retained it.