SCJA is the exam that has been discontinued in favour of more comphrensive and
SCEA. SCJA consisted of only one multiple choice exam simmilar to JCP whereas SCEA comprises of 3 exams one of them is multiple choice simmilar to SCJA.
There is no point in discussing abt SCJA as it no longer available.
At Javaranch We have various links and resources if U wanna see details of SCEA
Deepak Arora
JCP, IBM-uml (486), IBM-xml(141)