For the multiple-choice questions, will I be told how many options to choose for each question in real exam?
What is the policy on posting questions I saw on the exam?
You may not describe or talk about the questions you saw on any of the Sun exams - see the JavaRanch's Policy on Real Questions for further details.
What other certifications do I need before I go for the Junior Associate certification?
No prerequisites for this certification.
Does this exam meet the prerequisite for the OCP certification?
No. You have to take the OCA (not the junior exam) to meet the pre-req
Where do I see my certification results? See our certview wiki page