WSP Certification / Gobuyside Aptitude Test

Looking to see if anyone can provide some light detail on either the GB aptitude test or WSP certification. Specifically,

1) if either are worthwhile, 2) if the WSP cert would be good prep for GB, and the relative difficulty of each (i.e. for a finance grad, could you pass the WSP with relatively little prep/not doing every module) 3) if GB is general finance or specific to, as the website name suggests, the buyside

Thanks!