Good source of problems for Knapp's Elliptic Curves?

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I'm studying elliptic curves (and eventually modular forms) out of Knapp's book because of the softer algebraic geometry prereqs. It's incredibly accessible but the problem is that I don't know I can apply any of it without a decent source of problems as a skill check. Without going to books like Shafarevich's Basic Algebraic Geometry or Silverstein's book, is there a decent resource of problems that are around the "level" of Knapp?