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There is a good material that can help you to be an advanced in Excel that I can share it with you.
You can send me an email request through my Email: and I will share it with you.
lynda.com has many good video courses. The site is not free, but freshments get 7 days free. 7 days can be enough to boost your level.
It's worth shot, good luck ;)
If you wanna learn it for free then go for http://www.skilledup.com/articles/free-excel-tutorialsif you wanna pay something up for good quality lessons then https://www.udemy.com/thebestexcelHope it helps.
https://www.udemy.com/courses/search/?q=excel&src=ukw&lang=en&price=price-free Its the best
I think you should check out edX.org , they have great courses, many are free, and the best part is that you can get a certificate when you finish a course for a small price.
