My English class was the hardest to understand, my math class had the most homework, and my history class had more notes.
A. NO CHANGE
B. My English class was harder to understand, my math class had the most homework, and my history class had more notes.
C. My English class was the hardest to understand, my math class had more homework, and my history class had more notes.
D. My English class was the hardest to understand, my math class had the most homework, and my history class had the most notes.

Random Topics:
Articles A and AnAsking and Giving OpinionSuperlativesModals and Present TensesGerunds/InfinitivesPresent tense AffirmativeConjunctions & PrepositionsPassive Voice - Past SimpleVerbs – Nouns – Adjectives - AdverbsAdjectives & PrepositionOther quiz:
Present Continuous for Future › View_______ (she/travel) to Brazil on holiday this summer?
A. Is she travelling
B. she is travelling
C. she travel
Quantifiers › View
The 80% of European countries have a good economy.
A. a lot of countries has a good economy
B. Nearly all european countries have good economy
C. Not many european countries have good economy
D. no one
Infinitive & Gerund › ViewHe admitted _______ the mistake.
A. to make
B. making
C. make
D. to making
Grammar › View
Tarkan is a singer ___ is famous all over the world.
A. who
B. which
C. where
D. whose
