Personally I think you might be over training. What are your stats?/ Height and weight and BF%. 6 days a week is a lot of lifting. It looks like from your routine you hit every body part twice a week. Unless you are on gear or you recover extremley quickly or you only do a few sets per body part, I think you are either over training, or you are going to be over training very soon.
Jayhawkk is right, every one's body is different what what works for someone else is going to necessarily work for you. The one thing that is pretty consistent is diet. Depending on your metabolism body frame and body type, you are going to have to adjust your diet accordingly. If you are naturally very lean and find it hard to put on size you are going to have to make eating your job, or, if you put on mass easily but store extra weight as fat easily your diet is going to be a little more strict and fine tuned to see the results you want. ( There is one body type in between called "Mesomorph" which puts on muscle easily and adds minimal amount of fat. These are the guys that look at a weight and gain muscle.) But for the sake of this and the likelihod that you are most likely to be an "Ectmorph" (very lean and hard to gain size), or an "Endomorph" (puts on weight and fat easily) is more likely.
You first need to figure out how many calories a day you need to maintain your current bodyweight, at your current activity level, and adjust accordingly. If you want to add size, you consume more calories than you metabolize in a day, or if you want to lose fat, you consume less calories a day than you metabolize.
Carbohydrates, Protein, and Fat are the three macro nutrients you should be most concerned about. I believe the recommened amount of carbs a day is around 2.5g per pound of bodyweight, and protein is around 1-1.5 per pound of bodyweight. (Anyone correct me if I am wrong, thanks!)
Your goals for your body are going to determine what type of training regimen you follow in the weight room. If you are looking for speed and power and strength, you would follow something close to a power lifters type of work outs. If your main goals was strength, you would probably want to stay below 8 reps on mose exercises, and if your main goal was muscle size, you would want to stay above 6 reps is most cases.
This was just meant to steer you in the right direction, and it is not all inclusive by any means. If anyone else has anything to add or correct please do , I won't be offended, and besides, I know you will anways.