UWorld is a great product for people looking for personalized studying, thorough explanations, and questions mirroring those on the ACT. UWorld is a goldmine for practice problems. I found the problems slightly harder, and it helped me tremendously. Self-assessment means you test yourself. Use the official self-assessment grids from the Council of Europe if you want to know your English level on the CEFR scale, which is standard in academic circles across Europe.
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