This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
I can't tell you for sure what are the differences between the JSP 1.2 and 2.0. Maybe someone else could but if you want you can figure this out by yourself looking at the specification documents for them, you can get these documents in the the following link on bottom of the page: http://java.sun.com/products/jsp/reference/api/index.html
About the JSF, it is a library (taglib) where you can find reusable, pre-build ui components that you have to use inside JSPs, so I think you have to study them both, but you don't have to study JSF for the SCWCP 1.4 exam.
The SCWCP 1.4 exam covers the following specifications: Servlets 2.4, JSP 2.0 and JSTL 1.1