That is what I was thinking Ankit and the reason I am posting it here. I am using the newest version of Wizlabs SCJP 6.0 and it had 3 questions relating to the above mentioned classes. That is 4.2% of your grade. Sure, it's not a significant amount but if your right on the border of pass/fail then it IS a big deal.
Would like to know if anyone has taken the real deal and seen ANY questions related to any concurrent collections?