The best method;
1. Choose a good textbook. Condense every page onto about 1/6 of a page so your notes are about one page per section. Do this HOWEVER long it takes (it used to take me about half an hour to do 1/6 of a page, and about 40 pages altogether. Use colour coding for definitions etc. At the end you will understand the work, rather than just having memorised stuff.
2. Tick things off the specification as you go.
3. As you go, make memorisation sheets. The most essential are;
i) Chemical tests - chemicals, conditions, what you see, interpretation.
ii) Map of organic reaction pathways.
Though there are others. Close to the exam, learn these by heart.
4. Do lots of past papers and memorise the definitions especially - they are often looking for a key word, and things often come up several times.
I was the only person in my class to get an A*, so it works.
Good luck!
Edit: Oh, and if you don't procrastinate you don't have to give up your social life.