i had two friends had the same issue too last week. MOM says:
From 1 January 2012, the qualifying salary for the Q1 Pass will be increased from $2,800 to at least $3,000 for young graduates, while older applicants would have to command a higher salary to qualify, commensurate with the work experience and quality they are expected to bring. The qualifying salary for the P2 Pass will be raised from $4,000 to $4,500. There will be no change in the qualifying salary for P1 Pass which remains at $8,000. Concurrently, educational qualifications requirements will be tightened. For more information, please refer to our press release.
and since you have 6 years experience you are not fresh graduate and cant apply under Q1 must me P1 or P2 chk the salary and requirement if not mostly will get your S pass don't worry.