You should only rest long enough between sets to catch your breath. You're trying to work out your muscles not your lungs. Doing any more than a few sets per muscle group will likely decrease your gains as a result of overtraining. And you ask if you should do more exercises for your chest and back because they are big muscles but yet you only have one exercise for your quads, which are the biggest muscles.
I'd remove your pullovers from your chest workout because those work your lats more. I'd take out the kickbacks and add dips for your triceps. I'd add leg presses for your quads. Take out your dumbbell bent-over rows for your back and the pushups for your biceps (those would work your triceps anyways). I'd also replace your incline curls with preacher curls. Replace your front raises with rear lateral raises.
And yes you can get into pretty good shape in 8 months, but you have to stick with it.
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"Great spirits have always encountered violent opposition from mediocre minds" -- Albert Einstein
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