I don't believe it will affect your chance of passing as I did the exams back-to-front myself and had no problems. That said, if your knowledge on .Net is no strong, studying and sitting 70-536 assist with learning the basics of .Net. It all comes
down to individual preferences :-
Jeff Wharton MSysDev (C.Sturt), MDbDsgnMgt (C.Sturt) MCT, MCPD, MCITP, MCDBA, MCSD, MCAD