Here at Hogwarts a number of classes are taught and different depending on the year. So information will be put here for classes and exams. If your character is currently studying a class and you have placed their grade lower than the expected, you may change it providing it is in character. If they wouldn't have gotten the minimum then you will have to take that off their NEWT list. If the character has likely to have failed the classes needed for NEWT, they can redo the year.

OWLs needed for NEWTs:

The following are the grades needed to advance to NEWT level:

Ancient Runes: E.*
Arithmancy: E.*
Astronomy: E.*
Care of Magical Creatures: E.*
Charms: E.
Defence Against the Dark Arts: E.
Divination: A.*
Herbology: E.
History of Magic: A.*
Muggle Studies: A.
Potions: E.
Transfiguration: E.

*Should someone take up the teacher for these subjects, they could change.


First year classes:

Astronomy.
Charms.
Defence Against the Dark Arts.
Flying.
Herbology.
History of Magic.
Potions.
Transfiguration.

Second year classes:

Astronomy.
Charms.
Defence Against the Dark Arts.
Herbology.
History of Magic.
Potions.
Transfiguration.

Third-fifth year classes:

Core:

Astronomy.
Charms.
Defence Against the Dark Arts.
Herbology.
History of Magic.
Potions.
Transfiguration.

Elective:

(1-3 of these chosen before 3rd year)

Ancient Runes.
Arithmancy.
Care of Magical Creatures.
Divination.
Muggle Studies.

Sixth-seventh year classes:

They can choose any classes they studied at OWL providing they got the right grade. They cannot study anything they did not study at OWL, unless it is an extra-curricular subject (see below).


Extra-curricular subjects:

Some of these can be taken on as extra classes, though only in NEWT level are they more of a proper class (with exceptions).

Alchemy: 6-7th graded.
Ancient Studies: 3rd+ as extra, 6-7th graded subject.
Art: all years as extra, 6-7th graded subject.
Earth Magic: all years, 6-7th graded.
Frog Choir: all years, not graded.
Ghoul Studies: all years, 6-7th graded.
Hogwarts orchestra: all years, not graded.
Magical Theory: 4th+ as extra, 6-7th graded.
Muggle Art: all years, 6-7th graded.
Muggle Music: all years, 6-7th graded.
Music: all years, 6-7th graded.
Xylomancy: all years, 6-7th graded.