Most students focus on papers from the last 5 to 10 years. Whether you are following the or Edexcel syllabus, ensure you are downloading: Paper 1: Multiple Choice (Great for testing quick recall).
This is a dangerous strategy. Exam boards change contexts. A question about osmosis might use a potato cylinder one year and a red blood cell the next. If a student has memorized "potato" answers, they will fail to apply the concept to the new context.
For the student currently buried under a pile of notes, the advice is simple: close the book, pick up a pen, and attempt a paper. It might be uncomfortable at first, but it is the only way to turn biological knowledge into exam success.