User blog comment:Sirebel/Gold, Gold and More Gold/@comment-86.163.140.123-20160615205111/@comment-28012994-20160702175402

Sirebel,  in a nutshell: FM reset all TTs in the career series. Go to one of the TT of a series of which you have completed 25%,50%,75%, or 100%, press race, and press return to go back to the home screen, and then restart the game, go back to that series and you'll see that your completion percentage has dropped below the previous one,  so if you then complete that TT you've pressed 'Race' before,  you'll get back to your previous percentage ( 25%,50%,75%, or 100%) and thus the subsequent GC bonus for a repeat completion bonus (1-3 GCs).