Once you secure the textbook (or the PDF), don't just read it. Use this method:

Check publishers like Tata McGraw-Hill (who often publish regional Indian authors) or Technical Publications. They occasionally offer e-books for a reduced price (often 50% cheaper than the physical copy) via apps like KopyKitab or TeachNook.

The transition from combinational to sequential logic is a challenge for many students. Vijayendran’s step-by-step approach helps demystify this.