Download from the following link:
abap-certification-questions
sap-abap-exam
Download an excellent ebook on ‘SAP ABAP Interview Questions, answers, explainations: ABAP Certification Review’ :   ABAP CERTIFICATION REVIEW
SAP CERTIFICATION SYLLABUS:  Click here to view
Posted by: Cinthia Nazneen

If i_final is the final internal table containing  retrieved business data, and w_final is the work area of your final internal table, then you can display the result (classical report view) by writing code in following manner.
*&———————————————————————*
*&      Form  TOP_OF_PAGE
*&———————————————————————*
*       For data display
*———————————————————————-*
form TOP_OF_PAGE .
IF NOT i_final[] IS INITIAL.
ULINE.
WRITE:/1 sy-vline,
2 ‘PO Number’,
12 sy-vline,
13 ‘PO Line Item’,
25 sy-vline,
26 [...]

In SAP, highest level of organization structure is client.Whenever we login to SAP system, we login to a specific client. Data in the R/3 sytem is categorized as client-dependent and client-independent.
Client dependent table:
Client dependent tables are always client-specific. These cannot be accessed from any other client. First column of any client-dependent table is always client(type [...]

There will be different types of events in ABAP.
Events in Dialog Program
PBO - Process Before Output
PAI - Process After Input
POH - Process on Help
POV - Process on Value Request.
Events in Classical Report
INITIALIZATION
AT SELECTION-SCREEN OUTPUT
AT SELECTION-SCREEN
START-OF–SELECTION.
TOP OF PAGE
END OF PAGE
END-OF-SELECTION.

Control Break events related to Internal Tables
AT NEW FIELD
AT END OF FIELD
AT FIRST
AT LAST
Events in Interactive Report [...]