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Evils prevaling in Indian Society during Raja Ram Mohan Roy:
i) Religious bigotry 
ii) Polytheism
iii) Female Infanticide
iv) No education for girls
v) No widow remarriage
vi) Purdah system
vii) Child marriage
viii) Sati
ix) Social inequalities
x) Rigid caste system
xi) Supremacy of priestly caste.

How he fought against social evils:
i) He studied the Vedas, the Bible, the Koran. This convinced him that all religion preached the same fundamental truths. he condemned priests who exploited and mislead people into practicing customs like sati and child marriage.
ii) He strongly believed that the vedas contained the essense of Hinduism. He fought against the evil practises in Hindu society.
iii) He founded the Brahmo Samaj in 1828. The Brahmo Samaj helped in the following ways:
a) Abolition of Sati and child marriage
b) widow remarriage
c) denounced the caste system
d) modern education for all
e) promoted equality of rights for women and their right to property.