I have not studied in techno school but I have heard many things about it as I go to Narayana Olympiad school. When I saw techno school, my experiences were :-
Very unhygienic place
No English speaking staff
Students speaking bad and dirty language
Very difficult textbooks
Pls I suggest you don't join e techno but join Olympiad schools. Olympiad schools have well qualified teachers, good labs, disciplined and ethical students as well as a hygienic area and playground. If you're children want to pursue iit or other engineering institutions, enroll them in Olympiad school, a children friendly environment.
The fees excluding other charges is around 80000.