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Hey @11silviop, welcome!
Yes, Kaplan Schweser itself is an all inclusive third party study material provider. I used it myself when studying (and passed) the CFA exams years ago.
There wasn’t a CFA Institute Learning Ecosystem in my days (I assure you I’m not that old 🙂 ), however, I do find the end of chapter questions useful, so I would use the CFAI learning ecosystem as a secondary reference resource. Your plan sounds like a good one.