Hi there, I would like to know if there are any supplementary or beginner's guide to refresh maths for someone who hasnt been studying for 2 yrs before diving into the FRM materials. For instance, the logarithms, differentiation etc. Are there any good books without professor language so i can refresh my maths without getting intimidated? I plan to take the FRM next june and prolly will subscribe to bionic turtle after i registered for frm. Are there any maths tutorials there? Thanks!