No. Nobody can. Search engine rankings are, by their nature, unstable. Google regularly implements changes and updates their search algorithms, so it's impossible to guarantee a particular position for a specific period of time.
What we do guarantee is that we'll do everything we can to help your site rank as highly as possible and get as much relevant traffic as possible. And by creating valuable content that answers questions and solves problems, we'll give your site the best possible chance of reaching the top.