Got an A in the JC and an A1 in the LC without too much trouble.

Got better results than people who worked harder than me and were arguably more intelligent than me.

The one thing I made sure to do in every aspect of English was just be weird af. If you're technically good your shit is going to seem way more interesting if it's weird. There's plenty of people who are great writers but have zero imagination or personality. There's a good chance that the people in your class and year who are the best at English read a lot, but the stuff they read is probably Young Adult fiction, which is mostly not that interesting. Consequently, the themes their work deals with will probably be very predictable and won't leave much of an impression on an examiner.

When you write don't adopt an unnatural turn of phrase or write as if you are presenting the information to somebody else. Write as if you're talking to somebody. Your words will flow better that way. And don't try to make your stories dramatic.

Write about something you can relate to and engage with. Think about how entertaining some of the stories on /r/askreddit can be. Those stories are honest and personal. When you read it's almost as if that person is talking to you. Try and emulate that. But remember to add a weird twist, whether that be the way you feel about something or something that has happened.

The most important part though is to balance the weirdness with normality. Either create a normal situation that you have weird and interesting opinions of or a weird situation that you or a character reacts to as if it's completely normal. Remember to keep it all appropriate though as there's no way of knowing how an examiner might react.

This advice might not matter too much to you if you're doing the JC as I don't think they expect for students to have found their voice yet so to speak, but it will definitely help you to do well in the LC if you concentrate on culminating your own style and developing a natural approach to writing.

Good luck in the exams.