1. It is located in P.G.I campus sector-12 chandigarh.
  2. This school is from pre-nursery to class X, it lays stress on all round development of pupils.
  3.  Different types of curricular and co- currilcular  activities are conducted from time to time.
  4. In the session 2019-20 students  participated enthusiastically in activities like poster making, rakhi making,debate and declaration,essay writing competition,etc.
  5. Students participated in science fair in science and maths category,conducted by state institute of education .
  6. Staff of GMHS-12 believes in enthusiasm,innovation and constant effort to make their students good and successful citizens.
  7. various facilities like MDM, scholarships, uniform and stationery (upto class VIII) etc are being offered in the school. 
  8. G.M.H.S -12 was launched in 1992. The primary medium of instruction is English and the student teacher ratio is 35:1. The school tries to provide best learning environment.
    This school runs classes from 1 to 10 to provide education to students. The current student strength of the school is approximately 843.  It has a library as well with over 1434 books.
    The school has given exceptional results in the academic sphere and its students have excelled in extra co-curricular activities too.