Iusually study in maths i work . in biology , in russian , in .

Hard, with my teacher, i understand everything , i like russian poetry, i must write straight, i must to have good marks

In literature we are read and learn the poem.
In maths I work very hard.
In english we study a lot of english words.
In russian we should write the text.
Можно использовать такое словосочетание, как we can have a good marks.