For this one: put on the wind (205º/15kts - using 'wind down' method),
centre dot on TAS (227kts)
put track (316º) under HEADING index
note drift is 4ºStbd and put track under 4ºStbd
drift is still 4ºStbd so required heading is 312º and groundspeed is under wind mark: 232kts.
Are you using something other than CRP5 ? All 'slide' type whizz wheels should give the correct answer. The circular Jeppessen whizz wheels only offer an approximate answer and are very 'fiddly' to use.
There are a lot of questions in the nav exam which require quick and accurate use of the whizz wheel.