From my
SCJA book in regards to the SCJA which is now the OCAJP 5/6 (1Z0-850) exam:
"We strongly recommend the SCJA certification to the following candidates:
• Entry-level and junior programmers wishing to start and/or continue down the path of using Java technologies.
• Software developers and technical leads wishing to solidify their Java-related skillsets.
• Project and program managers wishing to gain a true perspective of the work and challenge of their teams complementary to their planning and direction.
• Computer Science and information system students wishing to complement their education
• IT job seekers looking for a well-deserved edge
• Certification seekers wishing to round out their resume or curriculum vitae"
In regards to the OCAJP 7 (1Z0-803) exam, it's primarily good for matured programmers & software developers.
Additional reference:
https://coderanch.com/how-to/java/OcajpFaq
-- Robert