(1) After doing ablution (wudhu), most of the time I have doubt that whether I have done masah of head or not. What should I do in this situation?
بسم الله الرحمن الرحيم
(Fatwa: 1167/1178/SN=11/1438)
Your doubts are mere suppositions. However, perform wudhu attentively. Yet if you have doubts then pay no attention towards it and offer salah with this wudhu.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband