What kind of test shoukd be done after a really bad fall hitting head on concrete wall and then landing on Outstretched right arm and wrist?

Depends. Important factors: the nature of the fall, past medical history, medications, symptoms, exam. If neck/wrist pain, xrays indicated, (splint painful wrist even if the xray is normal - if not better in a few days, needs more testing). If passed out, or if problems with memory, a CT head scan is usually done (not essential if neurologic exam is normal). All the above assumes a normal exam!