Solving is a tier-3 strategy consultancy, though it strongly believes it is better than the MBB.
They don't work for the industry leaders but for the challengers only.
In finance it is crap since they purchased an IT consultancy - called Synagir - in 2006.
Try Roland Berger, ATk, etc.. first. If you can't join them then Solving is better than Ineum or the likes, except again in finance.