dear student,

programming in C

data structure

algorithms

computer architecture and organisation

database management systems

data communication

software engineering

theory of computation

microprocessors

data mining

operating system

computer network and security  ets.

                  apart from above mentioned subject there are some other mathematics and non CSE subject which are also taught in 1st&2nd year.

these are main core CSE subjects.
                                                    

hope this may help you........