What do i do after enrolling for driving at CDC?

The lady at the counter was speaking pretty fast today and I didn’t had the time to digest what she said.. Just wondering, what is my next step? what is internal evaluation and how does it work? if i’ve paid for enrolment and 4 theory lessons, why am i prompted to pay $53.50 when i want to book theory lesson under “booking” tab?
(sorry that i asked too many questions! id really appreciate some help over here thank youuuuu:’-))