Duo Russian Grammar

26) People 1

A student

Russian has different words for a school student (aka a pupil, BrE) and a college-level student, which both have masculine and feminine versions:

  • учени́к / учени́ца – a school student or a student/apprentice in general, especially in spiritual sense
  • студе́нт / студе́нтка – a college or university-level student (attends a corresponding institution)

Молоде́ц is a word you use when someone "did a good job". It comes with a patronizing shade, so ideally you use it towards your friends or actual students/ subordinates (but not towards people whose work you are in no position to judge).

5 men

When you are counting people, use "челове́к" for numbers that end in «пять» (5) or more. Anywhere else use the normal Genitive plural "люде́й" (with много and мало both are possible, but I'd stick to люде́й).

Learning and studying

OK, Russian has a number of ways to express learning, but in this course we have учи́ться, учи́ть, and занима́ться. The 1st verb, учи́ться, is introduced in this skill. Here is a bit more:
meaning examples
учи́ться to study (e.g. to attend classes or to do self-study) Днём я учу́сь.
учи́ться в(на) + Prep. to study somewhere; to be in nth grade/nth year Де́вочка у́чится в шко́ле, в 3-м кла́ссе.
учи́ть + Acc.subject to learn, to memorize something («наизу́сть» ="by heart") Я учу́ слова́. Я учу́ ру́сский язы́к.
учи́ть + Acc + Dat to teach somebody something Я учу́ студе́нтов ру́сскому.

Doctor

The usual word for a (medical) doctor is «врач». Then you have «до́ктор», which is also OK but informal. However, a "doctor" as a person with this level of post-graduate qualification is «до́ктор» with no alternatives.