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Hi @pappu_pandit – it depends on your study style.
Some of us prefer the more summarised notes from providers and are willing to spend some money to get them, whereas the curriculum is very comprehensive and preferred by others too.
One good way is to use providers’ notes and materials, but supplement them (if necessary) with reference to curriculum, especially for sections you’re weaker in. I personally ignored the curriculum and used Schweser (other providers weren’t available at that time) as I didn’t have much study time given a hectic full time job!
Hope this helps, I’m sure others have advice to share too.