But seeing that 12 minutes is not enough (trust me) for such a huge table of information, you will need preparation!
Yes, so my recommendations for applying to Citi is:
1) Come up with a ficticious CV and not your real name. Use another email account to correspond. Make sure its a good one such that they send you to the numeracy test.
2) Get invited to the numeracy test.
3) Do the test on your ficticious account.
4) Print screen every question. (and circulate it on the web if its legal)
5) Practice the questions and the format.
6) Now go apply with your real CV and email address, and do the numeracy test over again! Ace it and proceed to the next step!
Now that is preparation. Beat that Citi!