I've seen that chart before, however, I want a specific answer for old imgs, not just any "graduate". Seeing how it takes 2-3 years learning basic sciences at university, I find it difficult to imagine how someone with very poor basic knowledge can learn perfectly 7-8 subjects in as many months. Am I missing something?
Most graduates who have voted in that poll are just like you 2 to 3 years after grad and therefore I firmly believe in its accuracy.
When you revise for Step 1, it's not like when you go to medical school. The comprehensive review books available have made it much easy to master the prep and you don't need to read big textbooks as you probably have done in medical school.