World Tour tracks are unlocked one at a time. In order to unlock the next Qualify track, you must get 3rd place or better on the current track.
The better the placement, the more silver coins you will earn, but you’re only required to get 3rd place to progress to the next track.
If you’re having trouble beating a track, we suggest you upgrade your current sled or buy the next sled. Sometimes you might be losing because you are not taking the best line. Try to find alternative rhythms through the tracks (or watch what lines your opponents take), and see if approaching the track differently makes you faster.