Tough question Mohan! Depends on whether u want to pass or learn and how much time u have. But the shortest would cover among the resources given here ---http://www.javaranch.com/scwcdlinks.jsp as i think ---- SERVLET/JSP specification and
Java Servlet Programming by Jason Hunter (O'Reilly) and Professional
JSP by Wrox. Plz correct me if i missed something....
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Muhammad Ashikuzzaman (Fahim)
Sun Certified Programmer for the Java� 2 Platform
--When you learn something, learn it by heart!