The subjective papers before the format change won't be of much help to you. Trust me, there is a world of difference between objective and subjective papers. For example, I always thought I did better in my objective papers as compared to the subjective ones and yet when the results came, I found my subjective paper rank considerably better than the objective one. Which suited me just fine
What I am saying is - look at the papers, but you are not competing with yourself. You need the test series to gauge where you stand. They will help. But never let them discourage you - I was was advised by FIIT-JEE after giving their Main Open Test (it was the biggest in India) to consider preparing for state level exams! Use the exams but don't think their results reflect the final result.