Here is a detailed bus route for you:
Beijing station:
Beijing Railway Station-take Metro Line 2 to Chongwenmen-transfer to Metro Line 5 to Songjiazhuang-transfer to Metro Yizhuang Line to Tongji South Road-take the school bus to Suzhuo International Fitness College.
Beijing West Railway Station:
Beijing West Railway Station-take subway line 7 to Ciqikou-transfer to line 5 to Songjiazhuang-transfer to subway Yizhuang line to Tongji South Road-take the school bus to Suzhuo International Fitness College.
Beijing South Railway Station:
Beijing South Railway Station-Metro Line 4 Daxing Line to Jiaomen West Station-Transfer to Metro 10 to Songjiazhuang-Transfer to Metro Yizhuang Line to Tongji South Road-Take the school bus to Suzhuo International Fitness College.