I'm applying to graduate schools for biochemistry, biophysics, or microbiology. Last time I applied to seven schools and got rejected from all of them. I don't know for sure why I was rejected but I think it's partly because I applied to to many big name schools where they receive a lot of applicants. How can I make sure I'm applying to schools that are in my league and what can I do on my personal statement to help me get in? Thanks.