Apart from what has been mentioned earlier, Based on the schools and the standard of your child it will vary. It will be around 65 thousand to 1.2 lakhs/year for a 4-6 standard with van fees around 20-30 thousand/year for 7-10 kms travel from school to home. Book fees come to 4-5 thousand a year. Uniforms and shoes come to around 5 thousand each set.
you can get an idea about the actual fees for the two popular schools in Bangalore DPS/NPS
The easiest way would be to make a list of the school, get a relative or a friend to visit the CBSE school, because, every school by default of needing to display the fee structure, display it in their notice boards.
Aren't you a little later because, since mid November and December, I've seen ads for admission process? Please check this once because applications in most schools should be in by dec/jan for the admission.