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Thank’s for your answer.
I checked the website of Arif and found free videos for the 2015 exam: https://irfanullah.co/cfa-1-free-2011-video-lectures/
What do you think? Are these clips enough or would you recommend the package for $220? The schweser package was really expensive and I am glad if I must not spend another amount of money for additional material. And on the other side, isn’t it a bit risky only “learn” with the videos and just test myself with the schweser practice questions? Does Arif cover all?