My opinion is you should take the SCWCD first and then give the SCBCD next. SCWCD concerns with servlets and JSP and JSTL with , web security and some patterns, in the exam objective. SCBCD concerns with EJB. Since servlets and jsp are used to generate dynamic web pages primarily and still developing web pages is a thing that every web developers would be starting with, you should acquint yourself with it. What better ways to do that, than first giving SCWCD a shot?
I suggest you take your WCD first and then go on with your BCD. As Arun said, BCD concentrates on EJB alone which WCD has JSP, Servlets in the curriculum. I feel JSP, servlets could be a head start to develop your J2EE application. Go ahead and start it! All the best!
I would suggest, take decision depending on what you are currently working on. are you working on servlets/jsp or EJB or if you are working on both. Then it totally upto you with which topic you are more comfortable.
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