This question demands a topical issue such as the dangers of alcoholism or drug abuse. I would encourage the student to thoroughly learn topical vocabulary and help them to devise techniques, such as flashcards, in order to help them memorise the key words. Then, I would emphasise the need to include interesting content and structure their essay coherently, whereby I would advise (and assist them with) drafting a plan and encourage creative thinking on their part. To conclude, in addition to comprehensive grammar advice, I would implore the student to read through their essay to highlight potential grammatical mistakes independently and resolve them autonomously.