I know for a fact, Jake's intelligence is not High. He is similar to Danny in this regard. He is cocky and reckless in combat as seen in the first episode and he makes foolish choices in life like you standard teenage. He does get better and can use his abilites well so currently as far as I know. His intellegince should be Average.
I'll do some work on his profile and add a Notable Attacks/Techniques section to better explain his powers.
Ya many protagonists just have average to above average intelligence instead of "genius" intelligence (unless they can command a nation or solve some big problems or researched on some great formula or devised a grand scheme).
But they still have excellent combat skills.
(One notable example would be Tohka Yatogami - below average human on daily issues, still skilled in combat.)
That will be noted in his intelligence given Jake can still fight the Huntsmen and Huntsgirl (in close combat), both of which are trained to fight and kill magically creatures. So he has some combat skill.
Also, Jake's Class 25 rating is unsupported. However, in the episode I just finished watching with the Tooth Fairy, he easily ripped one of those large monitor screens that you see in New York Time Square, off the building and tossed it like it was nothing. Don't know if that's class 25 but it's definitely a lifting strength feat. I'll link the feat tomorrow when I get the chance.
Edit: I've updated his intelligence and added a Notable Attacks/Techniques section.
At 9:40, Jake fires a powerful blast of fire that destroys a large structure and puts a hole in the ground. This happened do to him being effected by magic sneezing powder but the powder is not stated to increase his fire. He just couldn't stop sneezing.
At 21:37, Fread Nerks shots a fire blast that causes a creater and causes the inside of a volcano to shake and crumble a bit. the Volcano's size however is unknown.
From that blog I see that cutting trees can by Wall level to Building level depending on the tree size and how it's done. Jake is superior to a guy who casually chops down trees with his bare hands iirc but I think the trees were small, I need to check.
Well I'm watching season 2 and while I remember they changed the art style, I forgot how bad it looked. Jake's Dragon Form looked like he could manhandle people but now he's scrawny like Danny Phantom. But the worse thing about the art style is what they did to my girls the Oracle Twins!.
In season one they are actual twins, they looked exactly alike, the only difference was their personality, hair style (not color) and clothing. In season 2 they look nothing like each other, their hair style and color are different, eye color and face don't match and such. I didn't even know it was them until Trixe said their goes the freaky Oracle Twins and I'm like WTF!, they aren't twins, who are these girls.
Ok so Jake learns duplication in season 2 so we might need to put a season 1 and season 2 tab for his powers and abilities. He has shown to make only one so far without being enhanced by a magic potion.
Season two Jake gets Chi Manipulation and Duplication because in this episode his Grandfather decides to teach him more advanced Dragon Techniques and states. Dragons have the ability to "project their chi" and form it into a clone of themselves.
In the episode "Hero of the Hourglass" at 00:57, Jake blasts the Huntsmen into a stone pillar with his fire breath and at 1:02 we see the force caused the pillar to split and fall. At first we don't get a good size of how big the pillar actually is but at 1:29 Jake stops the pillar from rolling over the ledge and crushing people and gives use a full shot of just how thick that stone pillar actually is.
So the AP feat is Jack blasting the Huntsmen hard enough to cause the pillar split, the durability feat is Huntsmen tanking the force and getting right back up and the Lifting Strength feat is Jack stopping the pillar cold.