q.1: In British India, how did Presidencies differ from other provinces??? what made presidencies different? and what additional powers did they have??
Check the link hope it will help you.
http://en.wikipedia.org/wiki/Preside..._British_India
q.2: In which session did congress decide to start off Non-co-operation movement....and what was the reason behind it...
Gandhi led his non-violent nationalist movement satyagraha, as a protest against government repression evidenced, for example, in the Rowlatt Act of 1919, and the Jalian Wallah Bagh Massacres of April 1919. To enlist Muslim support in his movement, Gandhi supported the Khilafat cause and became a member of the Central Khilafat Committee. At the Nagpur Session (1920) of the indian national congress Gandhi linked the issue of Swaraj (Self-Government) with the Khilafat demands and adopted the non-cooperation plan to attain the twin objectives.
Q.3: There were total 482 seats for Muslims in 1937 election....which party won the most Muslim seats....it wasnt muslim league....
Total seats 1585 (Provincial Assemblies)
Muslim seats 482 (Provincial Assemblies)
Muslim League 106
Congress captured Muslim seats 26
Krishak Party in Bengal 35 seats (Muslims)
Unionist Party of Sikanday Hayat Khan 88 (Later another groups of 8 members also joined him. total strength 96)
Sind United Party (Muslim) 18
Rested of the seats of Muslims were won by Independent candidates or other parties.
Source: The Struggle for Pakistan by I.H.Qureshi.