Hi, not bad enough, from my point of view, I would recommend paying more attention to clearly defining your goals and justifying your choice in favor of biostatistics.
A little advice, of course, I do not know in what format the interview will be held, but an interesting feature may be your attention to low scores in some subjects, namely, indicate what you have done or will do to improve your knowledge of these subjects (the ability to set goals and solve your problems is always an advantage)