Hi Chakuttha,
Take a look here: https://www.symantec.com/services/education-services/certification/all-exams/exam-250-423.
I believe you'll have all you need there. I've taken the ITMS 8.0 exam myself last year and I recommend you take a look at the docs closely and also have day-to-day experience with Symantec ITMS.
Since Symantec is a closed world for non-partners, you won't find much material out there, like Microsoft, for instance.
So, in order to achieve your SCS, you'll need to work really hard for it.
Hope you'll give it a shot. Best of luck.
Kind regards,