I don't know the answer to your question about taking more credits at once than they have outlined for you.
I do know the pace they set is something like an extra class each semester in the first year of your ADN program, 2 in the summer in between year 1 and 2. Another class that fall, 2 that spring, and 3 in the summer after you finish your ADN. That is from memory so not sure if it's right, but it's something close.
Some of them go in sequence, but I would imagine you might be able to take some earlier if they are offered in those terms. Would be a lot of work since these will be very full semesters with the community college classes/clinicals you will already be taking.