yes.
my friends did direct test without go to driving school.
some pass with first attempt and some failed for test its upto you.

bring your application after, signature n company stamp to madinat khalifa police office in driving license office,bring copy ID, home country DL, and get eyes test there's dont forget take approval with captain police there's for direct test,then just go to any drivingschool and ask for direct test, you have 2 attempt for test.

goodluck.