malick, if you believe that practicing for the AIME & AMC contests will help, it may to a small extent. However, the whole point is that you struggle to find the answer on your own. Each year the contest has completely unique questions which implies that asking us for full-solutions is pointless. Every question you see on those contests will be different from year to year to ensure that students do not simply memorize how to solve this or that problem.
Contests are a measure of natural ability, your score cannot be forced higher through studying nor through reading a great number of solutions.