The blurb for Into the Labyrinth is hardly unique; an awkward insecure student of magic must somehow find his talent before entering a monster filled maze at the year's end. This is really the story of four students, three of which have unusual parameters to their spellcasting, and their enigmatic mentor who is determined to turn those challenges into opportunities that will make them effective battlemages. In a multiverse world where most of the population has at least some magic, and every mage's abilities are unique based upon their affinities and casting style, the characters have more in common with the average superhero than Harry Potter or other "kids studying magic" books. Also, despite what the blurb says, the Labyrinth isn't the focus of the first book, which would be better described as the adventures of a young team of superheroes as they face epic villains, traitors, and mysterious named Powers, all while trying to avoid becoming the pawns of interplanar politics.
The Mage Errant series - a unique magical world, books 1 and 2