Based on your interests in coaching for Class 11th students and your skills in operating a top-performing institute for NEET and JEE preparation, I would recommend starting a premium coaching center for Class 11th students in Chandigarh.

Key elements of the business idea:

- Establish a Chandigarh-based coaching institute that caters specifically to Class 11th students preparing for medical (NEET) and engineering (JEE) entrance exams.

- Position it as the premier destination for students seeking the best-in-class instruction, resources, and mentorship to excel in their Class 11th studies and secure top ranks in NEET/JEE.

- Leverage your expertise in running a successful "Topper's Choice" institute to attract the top-performing students and their parents in Chandigarh.

- Offer comprehensive course packages, personalized attention, and a track record of producing toppers to differentiate your institute from the competition.

- Invest in top-notch faculty, cutting-edge technology, and extensive test preparation material to deliver exceptional educational outcomes.

- Build strong industry partnerships and alumni networks to further enhance the institute's reputation and placement assistance.

- Implement robust marketing and student recruitment strategies to establish your institute as the preferred choice for Class 11th coaching in Chandigarh.

This specialized coaching center can capitalize on your domain expertise and the growing demand for quality NEET/JEE preparation.