How are the academics at UCSB?

I may be second doubting myself due to the fact that I see that academics are very tough here. I have ADHD and the quarter system might be too much for me to study for. I’m applying for pre-Econ/accounting so I’d be helpful to ask those majors how long they study for and what are the requirements to get into the major. I’m also curious if it really is that difficult to get the classes I need because I would be paying and extra $200k out of pocket if I did an extra year there, housing isn’t really my problem I’m mainly worried if I will be able to maintain academically. I want to go into finance so the lower gpa vs a semester system might have a negative impact. Let me know your thoughts!!!!