There are 3 questions needed to be answered in essay format. The best allocation for answering the question would be: for question 1&2, approximately 1200 for each. For question 3, approximately 1000.
To answer the question, you have to concisely articulate the relevant legal principles (provisions in agreements, rules in case law) and supporting each proposition with relevant case law (you have to find the corresponding case) and any relevant observations by commentators. All references to cases, agreements and commentary sources must be fully referenced in footnote. (So basically, when you answer the question, always find corresponding principles and provisions, case law, and commentary)
Questions and instructions can be found in attached documents. I strongly advice you to use WTO official website. You can find all trade agreements and relevant cases in WTO analytical index. Let me know if you have any questions. Thanks.