Language tips pls

What should I do to score the most in language? I don't struggle with transformation and fill in blank questions(grammar is fine-okish). What I struggle with:

•Essay- I usually lose 8-9 marks of essay I don't know how to avoid this. I would like to attempt argumentative and descriptive now. Share some tips on these two pls.

•Precis writing- I find it difficult to summarize what is asked unless I omit some points.

•struggle to make email and letter and essays 'sound pleasing' as teacher says but 'points are not bad'.

Please help me with this much. Thanks! [If u have good sample essay pls share]