In command at 48-40, the home standing Wildcats held off the Lakeside Lions for the victory.
West Seattle established an eight point control at 24-16 on Mohammed's two free throws with 4:28 left in the first half, but Lakeside rallied to trail only 24-23 before Jackson Golgart's runner sent the Wildcats into halftime with a 26-23 margin.
In the third quarter, West Seattle established six-point leads twice, but could not completely shake off its opponent.
Foul problems began to cool off the West Seattle Wildcat effort.
The Lions scored six consecutive points to tie the game at 33-all on a Max Knight 3-pointer with 46 seconds before the fourth quarter, but WS led 35-34 heading into final quarter action.
Nnanabu's short range basket coupled with a Simon Harris inside pass for a Nnanabu reverse lay up mushroomed the Wildcat lead to 39-35.
Outscoring West Seattle 5-1, the Lions forged the 40-40 tie as the prelude to the deciding moments.
Giomi was the Wildcat leading scorer with 14 points. Nnanabu was close behind at 13. Roman Barnet came off the bench for seven points and Rambang closed at six after his crucial fourth quarter contributions.
Max Knight was deadly for Lakeside with 19 points, including four 3-point goals. Omahre Gratton scored 13 points, but did not score in the fourth quarter.
West Seattle (5-4 Metro Sound division, 9-5 overall) hosts Seattle Prep at 7:30 p.m. on Tues., Jan. 16.