Just go through Introduction to psychology books ( Morgan and king , Ciccarelli , Barron ).
Important topics – perception, learning, memory, cognition, intelligence, motivation)
Theories or school of psychology
Psychoanalysis , behaviourism , personality theories – trait /type, learning theories – skinner,pavlov, bandura
All the disorders , their causes and symptoms.
Social psychology (Barron )
(Important topics – social influence, social cognition, attitudes , aggression, cognitive dissonance , impression formation, attribution , social interaction)
Statistics and research ( concepts – SD, mean, median, mode, T-ratio, validity , reliability, hypothesis ,regression, correlation)