ccip QoS preparations

after passing my bgp+mpls exam about 2 months ago its about time to study for qos to get my ccip cert before 27 october
so i thought i can get some tips from you guys who took the exam

im preparing using the following materials

1-cisco press qos book
2-INE ccip qos videos
3-the internet on anything not clear >cisco docs and ine blog..etc

so my questions are..
1-is these materials enough ? if not what else should i use ?
2-i wonder what's the gap between ccip qos and ccie r/s qos ?

the book contain some formulas like how to calculate propgation delay and serialization delay ...etc
do i realy need to memorize these formulas or they're there for demonstration only ?



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