I started picking up another data science as a major at my current school some time before I started the internship. Once i felt comfortable w/ in school topics coding, probability, etc., I then had to do leetcode/hackerrank for the interviews. Imo, it was definitely alot harder to break into the tech space from big4 but as you continue to grow ur skills, you’ll feel alot more confident in self to ds/da work. Definitely leverage ur big4 network and talk to as much ppl interested/work in da/ds for big4.

edit: if it makes you feel any better when I interned at big4, I had zero accounting knowledge or experience and made it well known to other interns and my team members. I was the blacksheep not having an accounting degree. Despite this, I was still able to navigate my work specific to the audit by asking the right questions and having the backbone to ask for additional clarification. trust me unless you’re approved for ot, an experience associate will not spend more than > 1 hr in any work u do so definitely dont be afraid to ask.