help! How to prepare for Investment Consulting interview??

Hi everyone! I applied for the Consulting Associate position with Cambridge Associates in the Beijing office (it's newly established this year). However, actually my past internship experiences and knowledge are limited to management consulting and I don't have a financial background, so I wonder how should I prepared for financial/investement related cases? (eg. read certain chapters of Vault Guide to Finance Interview?)

(I got to know that their interviews are mostly behavioral but definitely will a round of financial/investement cases, but I don't know how different it is from case interviews at MBB.)

Or how hard do you think it would be for me to secure the position? I just kinda screwed up my interviews with MBB and other top tier management consulting firm, and I really wanna join CA now! (pretty interested in investment and consider buy-side a future goal even if joined MBB)

My background:
Senior-year undergraduate from a top 2 university in China, high GPA
Major in English Literature and Economics
Oversea experiences
Interned at Monitor Group and Towers Watson

Look forward to hear your advice!
Thanks in advance, WSO:)