Albion under-19s will face rivals Exeter away in a title showdown next week after defeating visitors Orient 3-1.
The win in the Youth Alliance (South) division two came through an own goal and efforts from Mark Windsor and Adam Hinshelwood.
Martin Hinshelwood, Albion director of football, said: "It's gone to the wire as expected. The boys put in a decent performance against Orient. Adam doesn't get many but it was a well worked set-piece."
Albion hope to present the under-17s with their Youth Alliance title trophy during the interval at the first team match against Sheffield Wednesday at Withdean on Monday.
Hinshelwood said: "It depends on whether we receive the trophy in time from the Football League."
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