Here are some tips to build muscle fast:
Eat more quality food. You cannot be afraid to gain fat if you want to build muscle fast. Make sure you increase your protein content and increase your calories weekly as you get bigger.
Lift heavy and stick to core movement exercises. You want to work multiple muscles at once and able to lift as much weight as possible. Core exercises allow you to do this. You still want to stick to 6-8 reps, even though you are lifting heavy.
Do not miss workouts. You are not going to build muscle if you continue to skip workouts. Stay focused and on track.
Add some creatine to your diet. If you have the money, take 5 grams of creatine monohydrate daily. It has been shown to be one of the most effective and safe muscle building supplements over the past 10 years.
Do not overwork yourself. Training more often will not get you muscles to grow faster. If anything the more rest you get, it will allow you muscles to grow more.
Learn to skip rope like a fighter to achieve an edge in burning fat.