Fantasy - Magic based on the aura and its colors. Spoilers ahead.

[Monraz]

-The story is set in a world where people are able to expel an aura of some color, based on the colors of the aura (or glowing I don't remember what it's called), the purer the color of the aura the better, for example: if the aura has two colors it is worse than a solid one.
The following could be Spoilers:

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-I think it begins with the protagonist (male) taking his sister to a fair or something similar, there he enters a stall with a tarot machine or something similar And so he ends up being teleported to this parallel world with magic and where everything seems wrong, his best friend bullies him, his sister hates him etc.

-The story begins with the protagonist about to take an exam to determine the purity, color and intensity of his aura, I think it turns out to be a mostly orange aura, with gray or silver rings, barely managing to qualify to go to a magical academy and save himself to work in the factories of "mana" (or "orbs" i don't remember).

-At some point before or after the exam he receives a ring (or necklace) from one of his parents, who in the end turns out to have an entity attached to the ring, which offers him power.I think the colors have something to do with the kind of magic they can use?

-I think orange (or a similar color) represents fire and rings space magic or something like that (it seems to be something powerful but dangerous).

-The protagonist is offered the payment of the academy by a classmate who bullies him.

-I think that at some point teams are formed for tests, in one of them the protagonist ends up in a dark room and a rune of light (or at least shines) is engraved on his hand and the test passes.

-On the first day of school, Does his roommate throw a shoe at him?

-The classmate who pays him for college and bullies turns out to be a genius at magic.

-In the magic academy the magicians must choose two (may be more) subjects and the protagonist chose a class on "combat spellcraft " (may not be the name) (seems to have high difficulty in mental calculation, things like taking a formula and based on the conditions of the place such as the ambient mana and modifying certain parameters ) and runes (seals or something similar).

[David]

Hi! I'm a bit confused. You say that he was transported to another world, but then mention he gets things from his parents and his sister hates him. So did his whole family got transported?

Also, do you remember when you read this book?

[Monraz]

No, it is a parallel world.

[Monraz]

Only a few things change, like the inclusion of magic, and his relationship.

[Monraz]

M.... A year or two ago, I read it on the web I think.

[Kris]

Monraz, is this book for teens or adults? Is it a self-published story?

Try adding more plot details to the header/ topic title "Fantasy - Magic..." You can copy from what you've already written in the comments. Someone is more likely to recognize your book. If you would like help with this, just post a new comment.