Yes it is worth if you are planning to go for advanced certifications like OCE
EJB, OCE JPA, OCE Web Services, OCE
JSF exams. SCJP/OCPJP is per-requirement for these certifications. So instead of taking 2 exams (
OCAJP + OCPJP) you can complete SCJP (OCPJP 6 single exam) and go for advanced certifications.