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Firstly, you definitely need to be able to answer the CFAI EOC questions so carry on with them as you are. Secondly, as I remember the Qbank questions can be set to either “easy”, “medium” or “advanced” difficulty level. I found the Qbank to be useful to drill concepts and it definitely helped me to pass the exam but I only ever used it on the more “advanced” difficulty setting.
The Qbank is easier than the CFAI EOCs and also slightly easier than the actual exam (in my opinion) but its definitely worth hammering the Qbank questions….they will undoubtedly help you on the real exam.
Use the Qbank as you go through the material and then hammer the Schweser and CFAI mock exams with about 1 a 1.5 months to go before the real exam. That should set you up for a solid pass.