These would be typical teacher comments. I would make the following corrections:
2. Needs to work on English, Maths & Science.
Only English needs to be capitalized, the others are common nouns. I would use the word and instead of the ampersand [&]. Mathematics is always written as a plural, math is always singular. Also, since this is a command (imperative) type sentence the subject is you and the verb would be need. If I were writing this comment, I would begin with "You need to..."
4.A little hardwork will bring you laurels.
5A little hardwork will do wonders.
hard work is two words.
Student or Learner