This subject has very much similarity with basic electronics. It involves much details and lots of circuits in each chapter.
There are circuits of amplifiers , signal generation and waveform and many more. Make sure you’re familiar with the circuits already ,else the last day preparation would lead to confusion among circuits.
Books to refer to:
<aside> 💡 Electronics Devices and Circuits by Er. Bikal Adhikari has detailed and more content compared to Insights on EDC by system Inception.
</aside>
<aside> 💡 If you have time, I’d suggest reading both as some circuits and concepts are easier in one book and some on other.
</aside>
The insights is just enough to prepare for exam as it lacks few explanation in between which might lead one to confusion.