Повтор урока помогает мне лучше понять грамматику.

the grammar

Breakdown of Повтор урока помогает мне лучше понять грамматику.

• мне: me
• лучше: better
• помогать: to help

Questions & Answers about Повтор урока помогает мне лучше понять грамматику.

Why is it урока and not урок? What case is this?

Урока is in the genitive singular case.

The pattern here is:

• повтор чего? – повтор урока
  (repetition/review of what? – of the lesson)

In Russian, many abstract “action” nouns like повтор (repetition, review), изучение (study), чтение (reading) often take a genitive noun to show what they are applied to:

• повтор материала – review of the material
• изучение грамматики – study of grammar
• объяснение правила – explanation of the rule

So повтор урока literally means “the repetition/review of the lesson,” and урока must be genitive to answer the question чего? (of what?).

Could we say повторение урока instead of повтор урока? What’s the difference?

Both are grammatically correct, but there’s a nuance:

• повтор урока – short, slightly more “official” or “school-style”, often used in schedules, headings, etc. Literally: “review of the lesson”.
• повторение урока – a bit more neutral/abstract: “the act of repeating/reviewing the lesson”.

In this sentence, both would be understood the same way.
Повтор урока помогает мне… and Повторение урока помогает мне… are both correct; повтор урока just sounds a bit more compact and natural in the context of school/study talk.