There are two main abilities a Mage be able to use:
[Externalization] and [Fusion].
Any competent Mage must be able to utilize these two; at least, to some degree.
However, that doesn't mean it comes easy. After all, even in the Akashic Magus Academy, it takes an entire Stage—the Intermediate Stage—for students to be able to achieve [Externalization].
The Expert Stage also focuses on [Fusion], yet not every student is capable of achieving the full thing, hence the reason for the passing criteria being Partial Fusion.
Still, it isn't unheard of for students to possess these powers prematurely.
Apprentice Stage Students could reach [Externalization], and Intermediate Stage Students could attain [Fusion]. However, such achievements are usually reserved for special individuals known as geniuses.
And geniuses undisputedly emerge from Alpha Class.
So…
… How in the world was a Beta Student using [Externalization]?!