If you have the book (digital or physical), here is how to tackle the toughest modules:
: Multiple versions and comprehensive guides are available for viewing, such as the G.V. Kumbhojkar Engineering Mathematics 4 - Jamnadas (251 pages) and the M4-EXTC (Electronics & Telecommunication) Guide (306 pages). SlideShare : You can find detailed unit-wise breakdowns, such as this Unit II - Complex Integration engineering mathematics 4 kumbhojkar pdf extra quality