I'm doing edexcel for biology and on my exam timetable it says I have just two biology exams, paper 1 and paper 2. However when I try and find some past papers on the edexcel website it says unit 1,2 and 3. Can somebody direct me to the correct past papers? Is this the same for anyone else? And does anyone know the difference in terms of content between paper 1 and 2?
...or just paranoid?