In differential equations, the hardest part is often the first two steps (identifying the type and setting up the substitution). Practice just the setup for 20 problems in a row to build speed.
The week before an exam, pick 10 random problems from different chapters to test your readiness. Conclusion 3 000 solved problems in differential equations pdf
Websites like Archive.org or PDF Drive might have older editions, though checking copyright status is recommended. In differential equations, the hardest part is often