I found this "The Dropout" wizard subclass on Dungeon Master's Guild, and at first glance, it seems overpowered, as it gives abilities no other subclasses do. Note: this is a pay-what-you-want product.
Here is a summary:
2nd level:
- Scrappy Scholar:
- This is like the "X Savant" features that the PHB subclasses get, but for all schools
- Partially Educated:
- You learn 2 spells from your choice of the Bard, Cleric, Druid, Sorcerer, or Wizard spell lists, which can be cantrips.
- You can copy spells from the previously listed spell lists into your spellbook, and when you do, they count as wizard spells for you.
6th level:
- Class Audit:
- You get your choice of Potent Cantrip (From Evoker), Extra Attack (one of your attacks can be a cantrip) (From Bladesinger), or Benign Transportation (From Conjurer).
10th level:
- Alternative Education:
- As Partially Educated, but with Warlock, Ranger, or Paladin.
14th level:
- Ability Score Improvement:
- This is a normal ASI.
This seems OP because by 10th level, this wizard will have access to every spell. This means that they would potentially treading on the toes of other spellcasters. Also, I'm aware that this character would be able to pick cure wounds as their at-will spell at 18th level. However, this was already possible with Mark of Healing from E:RftLW, so I don't think this is a significant problem with this subclass.