Its the 172SP I did difference training on. I'll take your word its only 13, definitely a lot more that the AT3 which has just 1. Main problem is keeping track of which you've done as several are grouped together.

Chew pink or green bubble gum, then you can stick a sliver of the stuff over each drain point once you've checked it, colour appropriate to side of aircraft. This can easily be removed the next pre flight and replaced with fresh. For any under fuselage drains, use blue bubble gum.

If you're going to be flying a particular airplane / variant of an airplane, when considering preflight checks start trying to establish a routine. Means get someone to give you their checklist and explain / demonstrate what needs to be checked for each point on that list. Then check each individual point in turn according to the list. With experience you might consider writing your own lists in order to create a flow list but for the time being, just stick to following the list, mentally checking off the individual points.

With regards fuel drain points, for the 172R / 172S there are 5 under each wing so I tend to work from a given point - my routine is to start inboard front, then go to on the next one - inboard rear - from there move back to the front of the wing and a bit further outwards - and do each one in turn. The same goes for the three under the engine - here I work from the front backwards. If you stick to your routine, after a while you'll soon know which have been checked because your position under the wing will tell you which ones have already been checked.......

If I can't find blue gum, can I use Hubba-Bubba Yellow instead??? :E

Sure but perhaps not on a J3 Cub.

I started out on the Pa28 and made the move to a 152... Even after solo flights and quite alot of nav's in the piper. i found it extremly hard to translate to the ceasna. It took some 5 hours before i could go solo again i think it was. Its alot lazier than the 152. It will not stall, takes ages :) and as the lads said, will flot on for ages. the biggest difference i found was with the size of the two. The PA looks and feels about 3 times bigger, bulkier and slower. Now saying all this I've only been flying about 18 months or more roughly. About 60 on the piper and 40 on the cesna etc.. Of the two though i'll always come back to the piper. I like the more stable feel :ok: oh and exp in that time of two diff 152's aswell as the 161 and cherrokie