How to do the base turn course reversal?
If your worried something will be on the checkride (which is practical) you need to seek out more practical instruction on the maneuver. 

Procedurally this site offers a good explanation:


  Base turn consists of:
  
  
  a specified outbound track and timing or DME distance from a facility; followed by
  a turn to intercept the inbound track
  
  
  The outbound track and/or the timing may be different for the various
  categories of aircraft. Where this is done, separate procedures are
  published.