During my research on how to prepare and what to prepare,i have found this topic list very useful.
prepare it.

Data Structure [ Concepts, FIFO, LIFO, Link List, Binary tree, Graph, Nodes, etc ]

Computer Architecture [ Basic concepts,Instruction set, Addressing modes, I/O Intrusts Handlers, Registers, FF, Operation Codes, etc ]

Database [ Concepts, DBMSs, Logical DB, Security, Integrity, SQL, etc]

Operation System [ Introduction, Process Management, Deadlock, Memory Management, Cache, Disk Errors, IRQ, Addressing modes, Virtual Memory etc ]

Networks [ OSI Model, Standards, Topologies, LAN,WAN, MAN, RING, STAR, BUS, ROUTER, HUB, Modem, Full Duplex, Half Duplex, Encoding, Decoding, Asynchronous, Synchronous modes etc ]

Data Communication [ Basics, Modes, Multiplexing, DeMux ]

Object Oriented Programing [ Concepts, Polymorphism, Inheritance, Encapsulation, Data Hiding etc) , and c++ basic, GUI functions, Strings etc ]



Regards