yes, I know of several target schools for major IBs...to find out, all you have to do is go to the respective firm's website and click on a button called "Careers"...from there you will find a bunch of links...just explore around a bit and you will find a list of target schools that the firm recruits at....you will also find profiles of analysts, associates etc and where they went to school, what they majored in etc.....for example, the link below shows the target schools for Lehman Brothers...the link also shows which schools are recruited for which functions within the IB
School Contacts - Recruiting Contacts - Apply To Lehman - Careers - Lehman Brothers
Another link posted below shows the target schools for another IB called Lazard
Lazard Ltd