Just remove everything first and think about what things your neatly go on your desk to make it not distract you at all. Like only put the books that you need to study thats all, if you put allot of things then you might waste all your time looking for the books and you might also study the wrong thing. so get out what you need on your table then put a clock and say you wnat to study maths for example for 1 hour, then 30 min chemistry etc, then you might want to get a 5 min break and then study you weak subject for 3 hours.
First of all get all your notes ready, like if your doing chemistry, biology, make sure you make band 6 standard notes stricly to each dot point and print them and bind them in a floder, which is very organised and then just revieve these as much as you can. After this do about a paper a day, under time condition, stricly marking your answers, especially if you got a question wrong, go through those notes, then add the important information you got wrong, then you have every info to get a straight band 6.
Good luck, organise your room now asap, it is very important, which makes you study time easier.