The reading and listening are easy.
The mark scheme awards marks for doing a few different things in the writing section. Language, content and accuracy are among the biggest categories. For language you just have to make sure that you use plenty of tenses, including the subjunctive, imperfect and conditional. I also found it helpful to learn loads of "essay fillers" which are little phrases that can be added into any essay but are examples of high quality language. I also used idioms in a few places. To satisfy the content section just make sure that you pay attention to all the arguments you're taught in class so that you can put them into your essay. Using statistics shows that you've done research. It doesn't matter if you make up a statistic as long it sounds plausible. For accuracy just remember to check over the work. Common errors are disagreements with adjectives/verbs and genders and also missing accents too. Remember how to construct the various tenses. Also don't go over the word limit. I would always go over 240 words in class, which would not only mean that in the actual exam I wouldn't be awarded for material done after the 240th word but also that I'd make more mistakes due to writing more.
You'll find that as you practise essays over the year you'll get better at them as you adapt.
For the oral the same kind of advice stands, just make sure that you present statistics and ideas learnt in class. But the most important thing about the oral is that you're engaging with the examiner. So avoid huge gaps and make sure that it sounds like a real conversation as that's essentially what they're looking for with the oral.
Hope I've helped. Also some of the advice I was told might be different to what you've been told.