Is there any institute in Bangalore where I can take exam
The Jamf 100 course is free, and online. There's also a practice exam at the end of the course. You should be able to take the certification exam right from home. https://www.jamf.com/training/online-training/100/
You can take the self paced course and certification exam. Jamf 100 does not have any instructor led training.
You can prepare yourself for the exam through Training Material here and from YouTube Videos here
Once you are ready, You can purchase online exam from here
Feel free to ping / dm / private message me if you need any further information, I would be happy to help.