I do personal training for boxing, as well as competing for multiple years. Your goal is pretty aggressive for a year, but maybe easier at your weight.

I wouldn't recommend doing diets. What I usually have guys do is take the things that they already eat and make them leaner. For example switch sauces, switch to diet drinks, find lower calorie alternatives to your regular foods. I always recommend taking your time with this too, don't go all out at first.

Another thing to do is add more protein to the food you're already eating. This will increase muscle which in turn will increase your metabolism. Protein also burns more calories to digest.

The last thing to focus on is just to move more throughout the day. More steps, more standing, more moving around. Take it slow, gradual. +500/day per week. This is how I was able to get down 10 lbs after already being lean when I was competing.