A level mathematics - STRUGGLE

I am a year 12 studying a level mathematics,
I find myself really struggling to understand some concepts and ideas, I find the rest of my class picks it up SO much quicker than me, and I always struggle then have to spend hours at home to get to the same level of understanding as them. I really don't want to have to do the AS instead of the A level, as I don't see what doing AS can do for me at all and it would be pretty much pointless. especially as 2 A levels and 2 AS levels I not what unis are looking for at all

Especially with the statistics part of it, my teacher doesn't do the best job at explaining it at all and assumes we already understand it ( many people in my. class also agree ) , we are currently doing chapter 7 'testing hypothesis' and the whole binomial distribution and one/two tailed hypothesis makes no sense to me! I can't seem to find any website or video that does a good job at explaining it either. Does anyone know of any good math and stats resources that help understand it?
Thank you,

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