Brother i dont know about test pattern because vacancies have been announced by deptt itself, not through sindh public servie commision.
That's why test/intvew might be deptt itself. if deptt conducts test then it will consists of english, general knowledge of islamiat, pakistan studies, everyday science, etc.
About merit in these vacancies, i have no surity. but u should try yourself.
apply for these posts and prepare yourself.