Board of Secondary Education Assam Guwahati

I know the Board of Secondary Education Assam has its Head Office in Guwahati. But please give address and location map of its Head Office situated in Guwahati. Actually I want to send application form for Revaluation for Class 12th Science Exam. This year I have given exam of class 12th from Board of Secondary Education Assam. I got low marks in 1 subject, so I have to apply for revaluation for that subject.