What’s a good workout for abs, thighs, and pecs?

I’m a 19 year old girl, 117 lbs, and need some advice on how to work all my abs, thighs, butt, and pecs in 6 weeks. Plus, what exactly are some good exercises to do, what food should I avoid, and how long should I do each workout and how many times a week? Please help! I have a bet with a friend on this!