I feel the school I studied Tarun Madhyamik Vidhyalaya at Balaju Kathmandu the best. Being a fully government school it have option to study in both Nepali and English medium. Lately, the SLC results are very very good and the products of the school are top rated. Most importantly its so cheap as its government school, but remind you most of the time you need political jack or be extra ordinary to get admitted.