The best strategy for terrorists (in public servers) on this map is to split into two or three groups. One follow the bomb (the person holding the bomb) to the right, as if going to plant at bomb site B. Go through the double doors before the hallway to B and kill any counter-terrorists who get in the way of the bomb. Plant in view of the roof so the second group can protect it - on the target is one of the best spots - and protect.
The second group goes onto the roof area by either going left and up the stairs, then rushing onto the roof, or by jumping from a ledge by the terrorist spawn area to the window and rushing out onto the roof. The latter is faster, but the former is safer. Make sure you get the roof and protect it, because it gives the greatest leverage when planting at bomb site A. Be careful of counter-terrorists who might sneak up behind you on the roof.