Would be good if you could state your intent, so we can give you a more targeted answer.

In general, recruiters (especially in MBB) typically have 2 main functions.

a) Coordination: i.e. they organize and manage recruiting events, administrate the recruiting process / slot interviews & online tests, ensure pass/fail decisions are made and communicated, and act as general contact point for prospective candidates.  

b) Screening: they review the flood of applications and decide who gets and interview vs. not, or (esp true for MBA recruiting) channel applications to reviewers who then shortlist.  

It's important to note that in most Tier 1 and 2 consulting firms, recruiters do not get involved / have any direct mandate regarding case interview assessment. 

This means you reaching out to them can sometimes be of a little help to secure an interview invitation (esp. if you're profile is border-line to get invited), but that's also where it stops.