BCG Online assessment

Hi,
I've received an email from BCG saying that l've passed the initial screening and am invited to take their online case study that they will take place in 2 weeks, and they gave me access to their learning platform. However I'm not sure whether it's worth preparing for the online assessment since it will require a lot of hours and the recruitment process is so long (2 interviews 3 hours each if I pass the online assessment).
Given that I'm a fresh graduate l've just completed my msc in finance and have a bachelor's in Economics with literally no experience in consulting, do you guys think it's worth giving it a go or not?
Cheers