Hello Ananta.
Go to this page:-
http://www.ecdl.org/programmes/index.jsp?p=109&n=185
There are sample test papers here.
Go to ECDL / ICDL Advanced Syllabus Version 2.0 and, in that section, VISTA
2007 then Sample Test Paper (VISTA 2007) - ECDL / ICDL Advanced Spreadsheets.
There are 20 questions in here that you might like to ask.
Don't worry too much about the VISTA bit as that is not important (I have
tested it on other operating systems).
If my comments have helped please hit Yes.
Thanks.