It is strongly advisable to purchase the complete set of all 7 books, as each book is interconnected and designed to complement the others. Studying from the full set ensures a structured and comprehensive learning experience.

The ideal sequence for preparation is as follows:

1. Begin with the main book, focusing on building a clear and in-depth understanding of the concepts.
2. Follow this with question-answer practice from the question bank to strengthen application and problem-solving skills.
3. Move on to revision using the chart book, which helps in quick recall and consolidation of key points.
4. Finally, assess your preparation by attempting tests from the test series book, enabling you to evaluate performance and improve exam readiness.

Adhering to this sequence ensures a systematic approach to learning, practice, revision, and evaluation, ultimately leading to better outcomes.