Questions about a student's article

Correcting mistakes in passage
I helped a person to correct its passage.
Unfortunately, I am very weak at English.
I encountered a lot of difficulties in marking the passage.

The passage and questions are as follows:
[*** indicated problematic statements/things]

=

Today, my teacher told me to write a diary.
*** I need to use english to write this article.***
*** no important things are needed to write down.***

… *** A got better marks in biology test than me. I am very happy because he is getting

more

hardworking…***

…

Q:
1. *** I need to use english to write this article.***
Regarding the whole sentence, Is it grammatically correct? Even if so, is it natural enough?
Is it better to rewrite as "So I need to write this article in English"?

2. *** no important things are needed to write down.***
I can't really catch its meaning. I think of a lot of alternatives. See which is better:
- But this article is of no importance/significance // just trivia.
- But only trivia are included in this article.
- But there are no special/important things for me to write down
- But I don't have any special/important things to write down

Are the above grammatically correct?
Which is the best?

3. *** A got better marks in biology test than me. ***
First I think it should be higher.
Second is it ok to put "than me" at the end of the sentence? I prefer " Person A got higher marks

(than me) in the biology test." Any ideas?

4. *** am very happy because he is getting more hardworking…***
"…getting more hardworking". Is it correct?