Revision is an essential part of studying any subject, and it becomes even more crucial when it comes to topics like natural products and medicinal chemistry. These subjects require a thorough understanding of concepts, mechanisms, and applications. Here are some effective ways to revise these topics.

1. Create a study schedule:
- Allocate specific time slots for revising natural products and medicinal chemistry.
- Divide the topics into smaller segments and assign each segment to a particular study session.
- Prioritize difficult or unfamiliar topics, dedicating more time to them.

2. Review lecture notes and textbooks:
- Go through your lecture notes and textbooks to refresh your memory on the key concepts and theories.
- Highlight important points and make brief summaries for quick reference.

3. Utilize visual aids:
- Use diagrams, flowcharts, and concept maps to visually represent complex mechanisms and processes.
- Visual aids can help in better understanding and retention of information.

4. Practice with past exam papers:
- Solve previous years' question papers and sample papers to familiarize yourself with the exam pattern and types of questions.
- This will also help you identify your weak areas that need more attention.

5. Make use of flashcards:
- Create flashcards for important terms, definitions, equations, and reactions.
- Use these flashcards for quick revision, testing your memory, and reinforcing concepts.

6. Collaborate with peers:
- Form study groups with classmates or friends who are also studying natural products and medicinal chemistry.
- Discuss and explain concepts to each other, solve problems collectively, and clarify doubts.

7. Use online resources:
- Explore online educational platforms like EduRev for additional study material, video lectures, and practice quizzes.
- Take advantage of interactive tools and simulations to understand complex concepts better.

8. Teach someone else:
- Teaching someone else is an effective way to consolidate your knowledge.
- Explain concepts to a friend or family member. This will help you identify gaps in your understanding and reinforce your learning.

In conclusion, revising topics related to natural products and medicinal chemistry requires a systematic approach. By creating a study schedule, reviewing lecture notes, utilizing visual aids, practicing with past exam papers, using flashcards, collaborating with peers, utilizing online resources, and teaching someone else, you can effectively revise these topics and enhance your understanding and retention of the subject matter.