The best piece of advice I can give you is this: expect to do worse than you normally would have in the past! You're going to have to accept the straight Ds for a while until you can get used to the massive workload and harder content. But it's okay. Don't cry yourself to sleep because you got one bad mark. It will all turn out fine in the end! I went from an A star student at GCSE to practically failing but I just got my AS results and I've pulled it back up to A's.Also, actually do your homework. I made the mistake of pretending to do half of it and it doesn't work out well for you.And finally, my golden nugget of information for you newbies: it's not a competition!! For a long time, I put far too much pressure on myself to keep up with everyone else. Think of it like this: GCSEs might have been all about who can collect the most A stars, but A levels are all about you and your next step in life - all you have to do is get the grades YOU need for uni, nothing more than that. Don't think because you didn't get the same as your friend, that you're suddenly a failure.If you do all this, trust me, you'll be fine 😉