STUDENT: Julia is smart student.
CORRECT: Julie is a smart student.
EXPLANATION:

a. When describing a person or saying what he or she does as a job, we have to use the indefinite article A.

STUDENT: she is my best friesd.
CORRECT: She is my best friend.
EXPLANATION:

a. Always capitalized the first letter in a sentence.

b. Be careful with the spelling of FRIEND.

STUDENT: she can speak Japanese well.
CORRECT: She can speak Japanese well.
EXPLANATION:

a. When talking about a country or anything related to a country, capitalize the noun.

STUDENT: she is good at drawing a picture,playing the piano and typing .
CORRECT: She is good at drawing pictures, playing the piano and typing.
EXPLANATION:

a. When talking about general things that are countable, use the plural form of nouns.