Best exercises to build muscle & lose fat?

That's a really ambitious goal (lose 10% body fat in 4 months).

To build muscle, lift weights & have your protein intake toward the higher end of the healthy range.
To burn fat, cardio, especially if you can manage high-intensity interval training (HIIT), and eat slightly under your maintenance calorie goal.

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Here are some threads & blog posts that might help with setting goals.
Definitely read sexypants.

http://community.myfitnesspal.com/en/discussion/1080242/a-guide-to-get-you-started-on-your-path-to-sexypants

http://community.myfitnesspal.com/en/discussion/10012907/logging-accuracy-consistency-and-youre-probably-eating-more-than-you-think

http://community.myfitnesspal.com/en/discussion/819925/the-basics-dont-complicate-it/p1

http://community.myfitnesspal.com/en/discussion/872212/youre-probably-eating-more-than-you-think/p1

http://community.myfitnesspal.com/en/discussion/833026/important-posts-to-read/p1


Goal setting, including weight, calories, and macros
http://www.myfitnesspal.com/blog/MKEgal/view/2014-06-08-setting-goals-667045

Exercise basics
http://www.myfitnesspal.com/blog/MKEgal/view/2014-06-08-exercise-667080

You can easily do that & more!
1- know your daily BMR, Caloric goal & STAY UNDER that limit.
2- Eat 25% of calories from Carbs, 35% from Proteins & 40% from Healthy Fats.
3- Exercise a minimum of 5 days a week for at least 40 minutes. You must do Intense Weight Training, & HIIT twice weekly for 20min.
4- Optional : use Intermittent Fasting to help with Diet. Which means, don't have your first meal until lunch, 11:00am or after & don't eat past 7pm