Read Balakuruswamy C, C++,JAVA .
SSI Material for UNIX .
FOR ORACLE, SQL COMMANDS FROM ANY BOOK.AND DBMS CONCEPTS.

FROM C
POINTER
DYNAMIC MEMORY ALLOATION
PRINTF AND SCANF STMT
STRUCTURE
ARRAY

FROM C++
FUNCTION OVERLOADING AND OVER RIDING
VIRTUAL FN
INHERITANCE
BASIC OOPS CONCEPTS
INLINE FN
EXCEPTION HANDLING[ TRY, CATCH THROW -->ENOUGH]

FROM JAVA
THREAD
INHERITANCE
SUPER FN AND KEYWORD
CONSTRUCTOR
GARBBAGE COLLECTION
OPERATORS AND DATA TYPE.

FROM ORACLE
STD SQL CMDs
STD DBMS CONCEPTS[ NORMALIZATION, CONSTRAINTS]

FROM UNIX
BASIC UNIX CMDs
STD OS CONCEPTS[ THREAD, DEADLOCK, PROCESS HANDLING, SCHEDULING ALGORITHM

all the best

Covansys Interview Procedure and Tips for Preparation

Read Balakuruswamy C, C++,JAVA .
SSI Material for UNIX .
FOR ORACLE, SQL COMMANDS FROM ANY BOOK.AND DBMS CONCEPTS.

FROM C
POINTER
DYNAMIC MEMORY ALLOATION
PRINTF AND SCANF STMT
STRUCTURE
ARRAY

FROM C++
FUNCTION OVERLOADING AND OVER RIDING
VIRTUAL FN
INHERITANCE
BASIC OOPS CONCEPTS
INLINE FN
EXCEPTION HANDLING[ TRY, CATCH THROW -->ENOUGH]

FROM JAVA
THREAD
INHERITANCE
SUPER FN AND KEYWORD
CONSTRUCTOR
GARBBAGE COLLECTION
OPERATORS AND DATA TYPE.

FROM ORACLE
STD SQL CMDs
STD DBMS CONCEPTS[ NORMALIZATION, CONSTRAINTS]

FROM UNIX
BASIC UNIX CMDs
STD OS CONCEPTS[ THREAD, DEADLOCK, PROCESS HANDLING, SCHEDULING ALGORITHM

all the best