Trying to lose 15 pounds in 45 days

Doable, but tough enough given your close enough to your goal weight. Its basically 2.33 lbs every week, and would echo the advice above to do a lower carb programme. Doing so will help you feel less hungry (fat and protein is very filling), and thus more likely to stick to the programme for the 45 days, and also will help you drop any lbs due to water retention. I dropped 3lbs that I put down to either water retention when I started doing a lower carb programme about three weeks ago, and even if your body is only hanging onto 1.5/ 2, those can be vital lbs to drop in the context of an aggressive enough weight loss target. Also look into sprinting, even once or twice a week, as its reputed to be a great fat burner