Senior in College

I saw another forum talking about what other seniors are doing in college, and this got me thinking. Most importantly, I just need direction right now. For a little background, I come from a target school and just dropped the ball on IB recruiting. Took an internship in the middle office of a bank and the work easy to the point where it felt like I was wasting my time. I'm pretty motivated and in my down time at the internship I was studying up on technicals and everything (don't worry I wasn't avoiding anybody in the office or anything, I was still super friendly) in hopes of acing my interviews senior year, getting a job, and feeling like I had everything figured out just like everyone around me (I know that is not entirely true but it still feels that way). That was not the case. I keep bombing my interviews and I have no idea why. I am studying math and econ and whenever I go in for an exam that I prepare for, I am usually fairly confident, but in these interviews I'm just not. I'm stumbling over my words, second guessing myself, everything. Safe to say that even for the interviews I did get, that ship has sailed. As of now, I reached out to someone at my internship who I was super friendly with and he said he'd put in a referral for a Trade Management position. Obviously not what I want to do, but it's at least something (It's in my home city as well). The problem is that they do not start onboarding for newly graduated employees until the spring, and I really hate to wait so long and have it perhaps not even go through and then be completely f'd. Obviously I have been applying to other positions as well, but this does really feel like my best prospect. If this were to go through, I would also take online classes to bolster my technical skills in the hopes of being successful in another recruiting cycle, but by then I'm even more behind. I know my options are pretty slim, but there's got to be something. What do you guys think I should do?