sounds good to me, i’ll explain my thought process on them as well 
2: i chose calling, the suggestion is folding:
first of all, i also assumed his value range was beating mine because there was a 3bet oop from him which we have called, meaning he could have all kinds of big aces, even if he plays big pairs we are only ahead of bluffing pairs. on the other hand, we have shown him that we don’t have AK/AA/KK by just calling his 3bet. meaning he can and should double barrel almost anything here, including his bluffs. i still agree we are behind most of the time, but folding 2pair here still seems a bit too nitty and will probably be used against you if you only play the very top of your range. but the biggest reason i chose a call is that there are still a lot of good cards, sure, the K and T are good, but there aren’t many, i’m referring to the spades as well, not a a good value card, but as a good bluff card.
long story short: my thought process was that even though we are behind most of his value range, i see him barrel with almost all of his bluffs as well, and we have a few value outs, and another bunch of bluff outs.
5: i chose checking, suggestion is betting big
i chose checking here because even though we are holding tp decent kicker, we seem to be behind anything that would like to call a big bet here twice. so i chose a check for pot control so i wouldn’t go broke on a hand that’s just a pair with not even the best kicker, on top of this, check calling usually means either pot control, a draw, or a slowplay. pot control usually means they are going to call a big bet twice cuz of their marginal hand. a draw is possible but there aren’t many of them here, and the most likely one (JT) has just hit here. and clearly the slowplay we defenitely don’t wanna bet big into cuz obvious reasons.and there is alos a possibility we might even get more value out of checking as a weak hand might see this as weakness and bluff the river with it.
7: i chose 4betting, suggestion is calling
i chose 4betting because this is a very common restealing spot, we are in the button with no action, so almost everyone would raise here, which means a lot of players resteal from the blinds in this spot, meaning there are a lot of bluffs into his range. usually it’s hard to continue with a 4bet, but in this hand we have a great canidate to defend with. i fully agree that blockers with good backup equity are good aswell, but suited connectors and small pairs are having the best backup equity vs value 3bets, with the suited connectors being the better option because they have better postflop playability then small pairs. i agree calling is fine aswell cuz position, but i felt like 4betting would be better as it erases lots of bluffs giving free money. even if we get a 5bet we can easily insta fold knowing were crushed, but usually we aren’t
9: i chose calling, suggestion was folding:
i chose calling because of his very small cbet, and an utg raise can hold much missed Ax hands. however i fully agree it’s too hard to continue defending on this hand, so i did changed my mind right after i saw the right answer.
11: i chose checking, suggestion was betting:
i chose this answer for pot control vs slowplay and to avoid a potential Qx hand. however also on this question i made my decision too quickly as i fully agree on the bet now cuz of the given reasons
12: i chose checking, suggestion was betting
i had the same reason on this one as i had before, however with the call 3 times it does reek a lot more like slowplay. sure, this seems like a bad player, it probably even is, but still, i didn’t saw much hands call here all the way like that, the explanation mentiones it destroys potential two pair hands, which is true, but they exist out 96, 94 or 64. not really a range i would put someone playing UTG on. and tehre aren’t much draws here either. as for the hands that might consider calling which were ahead of, the only thing i can think of is maybe A9 so i mostly see hands like sets here or maybe QT-QA that floated the flop,
however now that i’m thinking of it, he might have more strange hands into his range given that he’s a bad player like K9 or maybe even weaker hands like that, depends on how bad he is.
so giving it another thought now, it seems like tehre are more good then bad hands out here to get value from. funny enough writing out my previous analysis like this helps to find the better answer 
this were all my thought processes going on on the hands i got wrong.
gl every1
FYI, the question I got wrong was because I considered the balanced approach and not the one better suited for this player pool. If we are honest in our reporting, I hope that this can evolve into a productive learning exercise.
