Hi sakgupt,
Fatigue and endurance 'issues' tend to get worse as a Test Taker gets further into the Exam (so a 'problem' that occurs in the Verbal section wouldn't necessarily occur in the Quant section too). Based on the information that you've provided, the inconsistencies between how you practiced and the specific aspects of Test Day (the time you took your Tests, the amount of sleep, taking the CATs at home, etc.) could have very easily impacted your performance. Tired brains tend to make bad decisions, choose wrong answers, not take notes, etc.
I have a few more questions about Test Day itself:
1) How long was the ride to the Test Center from your home?
2) Were there any distractions at the facility or during the Test?
3) What did you do during the two 8-minute breaks?
4) Did you finish any sections early?
5) Did you have to rush to finish any sections (and guess on questions just to finish on time)?
GMAT assassins aren't born, they're made,
Rich