Despite not producing the quality of football often seen in the early weeks of the season, the Star lads triumphed 4-1 at Wisbech St Mary.
James Hill-Seekings broke the deadlock when converting a Bobby Bick through ball before Harley Williams' classy individual strike doubled their advantage.
Sloppiness from Star led to their advantage being halved just before the break, but they remained in the driving seat and secured their passage in the final quarter-of-an-hour.
The prolific Hill-Seekings added his second when clinically finishing in a one-on-one situation before Sean Roberts saved the best until last with a stunning volley in the dying moments.
Star Under 18s: Aaron Dunmore, Dylan Horn, Daniel Colbert, Matthew Ilsley, Pululo Bivenci, Harley Williams, Sean Roberts, Lewis Darani, Bobby Bick, Joe Kelly, James Hill-Seekings, Ruben Rey, Ian King, Dylan Warrener, Mitchell Johnson.