If u have got access to R/3 system.. check transaction ABAPDOCU..
Go for Siemens material. Check the following link:
Use function module ABAP_DOCU_DOWNLOAD..
This will download 1100 documents to your local drive .
Please check also the foll links to start learning ABAP.
U can also get help from below links
Please chk the below links
This is link from SAP about ABAP certification
There is a pdf called ABAP certification.
You can try www.sapdoamin.com
They provide Certification simulation questions which are very useful and a must try site.
Have a look at below link for mySAP Technology - ABAP Workbench
Have a look at below link for SAP NetWeaver - ABAP Workbench
this is link from SAP about ABAP certification
In this link You can find Step by Step Scren Shot document :
http://www.sapfans.com/forums/viewtopic.php?t=66305 - this one discusses which way should you use - ABAP Objects calls or simple function modules.
Please check this online document (starting page 1291).
Also check this links as well.
SAP SCRIPT FIELDS
scripts easy material
Check these step-by-step links
for Smartforms material
How to trace smartform
check most imp link
step by step good ex link is....
List of all BAPIs
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Top-of-page in ALV
ALV Group Heading