Applied for two positions at one of MBB firms - resigning from one, still yet to be interviewed.

Hey, I have a dilemma. I recently finished freshman year and I applied for internship and campus ambassador position at one of MBB firms. I know people holding this two positions in past years (woking for the company as intern and doing campus promotion at the same time would be a good fit). Unfortunately I just found out that this edition the ambassador program will be two years long (previously was only one year long).

I don't want to be committed that long to that company (can't imagine having another internship somewhere else in a year or so and still having to promote this one firm - I think that won't work with another companies). I just finished my tests and interviews for the consulting internship and I am waiting for results (ofc not sure I will get it but I feel it is very promissing and I did well). I also have been selected for interview for ambasador and it is in few days. Do you have any tips on how to act on interview? Can't resign straight away or just tell recruiter I can't be committed that long to their company because I feel that could have impact on ongoing process with consulting internship. Seriously do not know how to act. Please help.