Lol, I hate RPA so so so much! I just can't stand it..I find it boring tbh, I enjoy F325 that's why I think I did well in it. I got 137/150
1) Go over all content thoroughly in OCR textbook/CGP revision guide
2) Then do the practice questions and examination questions in the textbook (though the exam qs in the textbook don't help as much because they're quite easy and there are qs from 2004 etc, so they're much easier than the challenging qs we get now, so you can't rely on only those exam qs)
3) I also did some practice papers from Jan 2008/June 2008/2009/2010, that my teacher gave me, I think they're from the OCR salters, not sure, I'll try and find them.
4) Then keep doing as many sheets/practice qs your teacher gives you
5) Then do the exam papers - what I did was sometimes when I had gone over a topic, say 5.1 then I would do all the 5.1 qs in the exam papers. By the time I did the papers in exam conditions i.e. in timed conditions, I would have not necessarily remembered the answer but I could tackle the question.
6) Once you can tackle the OCR A exam papers then do the stretch and challenge questions - they're very helpful
You can find them on the CD you get with your textbook.
So basically once content done + you've genuinely understood the concepts etc then practice practice practice to improve exam technique. For instance if it's 2 marks, only write 2 sentences, look at the mark scheme! and you could write some model answers how they want you to answer it. For example, I used to write so much for the buffer system qs but when you look at the marks scheme, they've only got 3 bullet points each - very short sentences for an increase in Hydrogen concentration/or an increase in OH concentration. Definitely try to tackle harder qs because they're including more and more stretch and challenge qs. Also, they've extended the time limit to 2hrs which is much better for this paper.
I hope this helps