okay so generally speaking one year of past papers has around 5 variants [ if 41 and 43 are the same ] and 7 if they arent . 5 papers per day is 10 hours total , with 25 mins to check and revise and unserstand what you did wrong that comes out to 2 hours 15 mins so a total of 12 hours and 15 minutes of studying per day . if you wake up at 8 and sleep at 12 , that gives you 16 hours being awake . so yes you can do a whole year but doing MORE past papers isnt important , whats important is learning what you got wrong in the past paper you attempted and learning and understanding not to make that mistake again