Nope, individual drivers require less Exp to level up than the overall total. For example it may take a million EXP to get to level 25 in B-Spec, but with a million EXP, an individual Bob could end up being level 27, if that makes sense. The problem is you can't see the indivdual EXP numbers for each Bob, so you can't see it until this kind of situation arises.
In my account, I am level 33 at the moment, but I have SIX B-spec drivers, five are level 30, 1 is level 31, think how many EXP it would take to get to level 30+ six times in B-Spec overall, it's MUCH more than the EXP required for me to get to level 33, unless of course what I said above is true.