i try to correct some of your grammer mistake.
1> first sentence is almost correct.
You can also say like this, "kya apne/tumne apna(your) kaam jaane se pehle thek se kiya.
2>niche aate samay apne saath pechkash lete aao(not jao).(here person is asking for screw driver that why not "jao" its "aao"
3>common mistake its not main ,it should be mujhe. or it should be like "kya main uske madaad karu?"
4.>kya mujhe abhe padhai karna nahe chahiye?
5>>kya hame (it not i,it is we so "hum" will use) abhe kaam karte rehna nahe chahiye?
6>>tum dushre vikalp ke bare ma kya kehte ho?
Thank you . Keep Learning :)