Second year college student with question pertaining to IB internship

I have just finished my second year of college at Sam Houston State. It is not a target school by any means, but the business school definitely has a focus on banking which I think helps out some. My main concern is that reading through the forums and guides on here I feel that I am very unprepared for the technical aspects of interviews or even working. I am a junior by hours which puts me at graduating in December of 2019. I still have some pretty crucial courses to go through like investments, commercial lending, and financial spreadsheet modeling which will help immensely in my opinion. The problem here is that I am applying for internships for summer 2019, and from what I understand the interviews and offers happen in the Fall coming up. I wont get to take my investments course until Spring due to a prerec class required. The point of this post is to ask if I need to be learning all the basics pretty much on my own even though I will likely learn it all in my courses this next year due to the interviews being so soon. I appreciate any insight or advice.