Schools of Magick 
Alteration
Alteration magick goes into the astral plane before manifesting on the physical (or another plane) through direct energy manipulation.
Example: Hydrokinesis, aerokinesis, chronokinesis, micro-PK
Conjuration 
Conjuration magick summons a force, spirit, entity, object, etc, typically by radiating energy from a center point.
Example: Weather spells, necromancy, ceremonial magick
Destruction 
Destruction magick aims to harm, deteriorate, or weaken a target typically through a direct energetic link.
Example: Hexes, curses, jinxes, evil eye
Divination 
Divination magick involves the analyzation of energy constructs into a decipherable and understandable form as psychic information.
Example: precognition, tarot reading, aura viewing, clairaudience
Enchantment 
Enchantment magick involves the binding of two or more energies in order to make the two influence the others own energy.
Example: talismans, potions, sigils, poppets
Illusion 
Illusion magick works on mental and/or emotional plane(s) in order to give impressions and influence the five senses.
Example: glamour, “invisibility”, calmness, paranoia, eye color
Restoration 
Restoration magick heals, protects, or strengthens a target typically through a direct energetic link.
Example: warding, circle casting, healing, protection
These are the seven schools of magick that I personally use simply for organization purposes. They are organized in this manner instead of more traditional manners due to my own approach to magick. This is not a summary of the extent of magick nor the practices involved. These are broad categories.
Many witches become witches when they lack other areas of power and wish to make change in their life. This is a very practical approach. They will typically organize themselves by the purpose of a spell: wealth, career, health, love, luck, hexing, etc.
I understand this practical approach, and I definitely use witchcraft when I need it for such uses. But I did not become a witch because of the practicality so much as I did because of the love and passion for magick itself rather than simply what it can bring me.
This love and passion and fascination manifested through my craft by creating a focus on the development of magick. The development of supernatural/psychic powers is the goal of my craft, as well as learning various methods to use my magick best. This has influenced my choice to organize my craft, as well as (now) my tumblr, in this manner. These categories allow me to manipulate energy in various ways to better reinforce my practice. These categories are not based merely on the end goal of magick, but the methods used to get there.
While not every alteration spell will have the exact same method, there will be similarities so that they reinforce each other. Spells of the same school will typically use similar energy manipulation.
This post which i found on tumblr really helped me organize my practice, and although i dont like the whole “Witchblr” community on there the all have some really great information on there that can be useful to any magician.
This post was made by Arcane Academy on tumblr they have a lot of great stuff they post about and here is the link to there blog