Start your coursework early, the day you get it in fact. Your workload builds up very quickly, and there's nothing worse than having an essay you know you'd do an awesome job of only to find you have 2 days to start it from scratch. make sure everything you hand in is the dog's balls. Ask for help if you need it, but don't be satisfied handing something in if you think it's substandard.
Pay attention to details. For essays, make sure you have a title page and a contents page, make sure it's formatted correctly. Make sure your references are in order and cited exactly how your uni's asked for them.
Look at past exam papers, and make sure you can answer everything they're asking - I can't stress this enough. Ask your lecturer to look at the answers you've put, get a feel what level of detail is required for a first. Start revising early.
Make time to relax too, though. It's easy to start going overboard/ getting obsessive but stress is a real concentration killer. Like i said - if you start your work early enough you will have time to complete it, rushing coursework in a panic at the last minute is soul destroying and you will hand in rubbish.
Hope this helps.