I am currently using Subhash Dey for BST and I recommend it for you .. it has a lot of case studies and concise yet well presented notes..plus its colourful unlike other BST books which seem quite boring.
it's better than GS Alag (I know b'coz I'd used that too)

Case Study Books for 12th Business Studies

There are several case study books available for 12th Business Studies that can help students understand real-life business scenarios and apply their theoretical knowledge. These books provide practical insights into various business concepts and strategies. Here are a few recommended case study books for 12th Business Studies:

1. "Case Studies Mentor in Business Studies" by Jatin Dedhia:
- This book contains a wide range of case studies based on the latest CBSE syllabus for Business Studies.
- Each case study is accompanied by questions that test the students' understanding of the concepts discussed.
- The book covers all the important topics and provides a comprehensive understanding of the subject.

2. "Business Studies - Case Studies: Based on CBSE Guidelines" by Dr. R.K. Singla:
- This book includes a collection of case studies that are designed to help students apply their theoretical knowledge to practical situations.
- The case studies cover various business scenarios and provide insights into areas such as marketing, finance, human resources, and more.
- The book is aligned with the CBSE guidelines and provides a thorough understanding of the subject.

3. "CBSE Class 12 Business Studies Case Studies" by Dr. Sushil Kumar:
- This book is specifically designed for CBSE Class 12 students and covers a wide range of case studies based on the latest syllabus.
- The case studies are accompanied by thought-provoking questions that encourage critical thinking and problem-solving skills.
- The book also includes additional practice questions and answers to help students prepare for their exams effectively.

4. "Business Case Studies" by Eddie McLaney and Tony Atrill:
- This book provides a collection of real-life case studies from various industries, allowing students to analyze and understand business concepts in a practical context.
- The case studies cover topics such as marketing strategies, financial analysis, operational management, and more.
- The book also includes comprehensive explanations and discussions on each case study, making it an excellent resource for deepening understanding.

It is important to note that while these case study books can be helpful, it is also recommended to refer to the NCERT textbook and other study materials provided by your school. These case study books should be used as supplementary resources to enhance your understanding and application of business concepts. Regular practice and thorough understanding of the subject are key to scoring well in Business Studies.