Return rate for Sophomore IBD SA at GS/MS/JPM

Hey guys, I go to a lower-tier target that has almost no representation at this one bank in particular (one of GS/MS/JPM) and I recently accepted an offer for 2019 sophomore SA in NY IBD after attending their superday. I am in shock still because this was my second Superday ever, the full extent of my networking was talking to an analyst from my school the week before (I just submitted my resume in the online portal) and I didn’t feel exceptionally well prepared (although I did connect really well with my interviewers). I am really going to give it my all to be prepped for this summer and try to get the return offer for Junior year, and I would really appreciate some insight into what % of Sophomore interns convert. I don’t know that many people that did BB internships Sophomore year, and I’m finding it hard to find info on how these programs feed into normal junior SA positions. Thanks!