Instead of trying to train each muscle once per week try a different workout which involves mainly compound exercises and a split that allows you to train each major muscle group twice weekly. You can even do a full body workout, 3 days a week, using compound lifts only. Focus on the following exercises: squats, deadlifts, bench press, dips, barbell rows, chin-ups, pull-ups, shoulder press. Do these exercises in the 6-12 rep range. Avoid too much isolation when trying to gain weight. You must rest more also. Try to rest at least one day for every day in the gym so that your body has a chance to grow. Eat more calories (quality calories) than your body burns daily. Ensure you're taking 1.5g of protein for each pound of bodyweight. In your case try to consume 200g of protein daily. If you can't do that try a weigh protein supplement. Eat often and get good sleep at night. Do some research, come up with a training plan and a diet plan, post it and people will give you some feedback.