Equivalence Partition for electricity counter

I have task to build equivalence classes, and boundary values based on given information

To calculate the electricity cost user should enter an old and a new values of electricity counter and press “Calc” button. It works only if values are entered correctly:

contain only digits;

no longer than 6 digits;

new value is not less than an old one;

I did this task, but i don't know if i did it right It would be great to get feedback

My equivalence classes and BVA