This is my extreme rough plan for the school setup. There are a lot more classes and a lot longer time you can spend there for education but I feel that Hogwarts should be one of if not the best school in the magical world, therefore, it will have a much wider variety of subjects and opportunities to attain there.
Subjects
Core/Mandatory (M) -
Charms M
Transfiguration M
Potions M
History
Defense against the Dark Arts M
Herbology
Care of magical creatures
Flying
Muggle studies
Astronomy
Languages
Year 2 -
Charms M
Transfiguration M
Potions M
History
Defense against the Dark Arts M
Herbology
Care of magical creatures
Flying
Muggle studies
Astronomy
Divination
Arithmancy (Basic intro)
OWLS/NEWTS/Electives -
Charms M
Transfiguration M
Defense against the dark arts M
Arithmancy (Need good basic grades)
Runes (Need good arithmancy grades)
Herbology
Medicine and healing (Need top 2 potions grade)
Potions M
Advanced Potions (Need top 2 grades)
History
Business
Wand Lore (Need good arithmancy)
Care of magical creatures
Muggle Studies
When Newts are finished the students can choose them for there Mastery.
Languages - Speach and Writing
Latin
German
French
English
Other -
Art
Music
Cooking
Clubs -
Dueling
School Orchestra
Quidditch
Each year is 2 years long
Total of 8 years
Age/ Subjects
Yr 1 11-12 (age)
1st set, basic introduction into base subjects (charms, transfiguration, history, potions.) herbology, care of magical creatures, defense against the dark arts
Yr2 13-14 (age)
Continuation of basic and delving deeper into a subject
Yr3 15-16 (age) Choose OWLS
1st set is choice, continue normal work just with OWL choices
2nd set prepare for exams
Yr 4 17-18(age) Choose NEWTS
Preparing for exams
Yr 5 19-20(age)
Taking exams
(400 students from Year 1 to Year 5)
Yr 6 21-22 (age)
Further study to Mastery
Yr 7 23-24 (age)
40 students from Year 6 to Year 7
Yr 8 25-26(age)
Completing Mastery
(20 Students in Year 8)
500 students in total
125 each house
20 per year group (up to yr5)
so 80 for all 4 houses per yr
40 yr6/7, all houses
20 yr8, all houses
If you see something wrong please tell me and I will change it.