I am not an expert...:)... will try to suggest with whatever knowledge and info I have.
May I know the grade ?
You could try Sister Nivedita School in Ameerpet, Chinmaya Vidyalaya in Begumpet, BVB and P Obul Reddy in Banjara Hills, Little Scholars and Hindu Public School in Sanath Nagar and Radcliffe in Balanagar. All these schools have low fee structure.
It is difficult to get in Chinmaya, BVB, Obul Reddy now. You could however call up and find out.
Just want to add one more school, DAV.
You can try for your nearest branch of DAV. They too have moderate fee structure with value education.
Thanks & Regards,