Kpk psc merit is determined as a whole in three segment s
1. 30 marks for your educational scores.the formula is as following.
your obtained marks in matric intermediate plus graduation and master (incase the job is for candidates of masters) divided by your grand total of matric intermediate graduation etc and then multiply by 30.
2.60 marks for interview
3.10 marks for distinction (means if ur HAFIZ E QURAN or gold medalist etc).
Regarding ur second question the syllabus for almost all the tests of kppsc is same with slight changes in each test that may be in some tests they may include maths, otherwise the rest is same.
Syllabus is as
1.eng grammer plus vocab
2.ISLAMIAT
3.PAK AFF or pak stdy
4.current affairs
5.general knowledge
6.eds (in few cases)