Hey, that's a great effort! I haven't even gotten around finishing the course, let alone start any prac exams!
You shouldn't be disheartened by your results so far. That's the beauty of prac exams: they are PRACTICE. And the more practice you do, the better you get.
You should continue doing practice papers:
- print them out properly (don't do them as a pdf)
1. For maybe the first 5ish that are from 2008-2011, take as LONG as you need to answer the questions. Refer to your notes, textbooks, friends, teachers... anything but the actual results itself. This is a learning process too. At this step, you are gathering the information that you need to answer the questions.
- After you've done one paper, mark it according to the provided results, and compare to textbook/notes. Highlight questions that you did wrong! Mark as hard as possible! Notes down areas of difficulty.
2. For the next few papers, don't use any notes (apart from data booklet) but take as long as you need. This stage is where you try to remember all that info and apply it, taking note of key words and phrases. This is also where you practice perfecting that writing/explanation skill.
- Mark it. If you're not sure whether you got all the points for a question, get a teacher to mark it for you. Again, highlight problem areas.
3. Go through all the exams you've done until now, and make sure you perfect each mistake!
4. Do the exams under exam conditions: timed and silent. Maybe get a group of friends and do a mock exam together.
- Get ANOTHER person to mark your answers AS HARD AS POSSIBLE! Hopefully by this point your average exam mark will improve!
GOOD LUCK! DON'T GIVE UP!