1. Comprehensive Coverage: A quality JEE preparation kit should cover all the subjects and topics included in the JEE Main and Advanced exams, such as Physics, Chemistry, and Mathematics.

2. Latest Exam Pattern: It should align with the latest exam pattern, including multiple-choice questions and numerical answer type questions.

3. Practice Questions: The kit should include a wide variety of practice questions and sample papers to help you become familiar with the types of questions asked in the exam.

4. Detailed Solutions: Comprehensive and step-by-step solutions to problems should be provided to aid in your understanding and learning process.

5. Conceptual Clarity: The kit should focus on building strong conceptual foundations in all subjects to ensure a deep understanding of the topics.

6. Mock Tests: Access to mock tests and previous years' question papers can help you simulate the actual exam environment and assess your preparedness.

7. Regular Updates: Trending kits are often updated to align with the latest changes in the JEE exam pattern and syllabus.

8. Study Plans: Some kits offer study plans and guidance on how to best utilize the materials to prepare effectively.

9. Video Lectures: Some kits include video lectures to explain complex topics visually.

10. Progress Tracking: Tools or features to track your progress and areas that need improvement.

11. Online Support: Access to online forums, doubt-clearing sessions, and additional resources can be very helpful.

12. Affordability: A trending kit should also be reasonably priced or offer good value for money.

When choosing a JEE preparation kit, it's important to research and read reviews from students who have used it to ensure that it meets your specific needs and learning style. Additionally, you may want to consider the reputation of the company or author behind the kit. Finally, it's important to complement the use of a preparation kit with regular and focused study, practice, and revision to succeed in the JEE exams.