What is Reddit's opinion of Help Your Kids with Maths?
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If I were in your position, I would hit the kid books that learn you the basics of math like this one here It should make it seem less boring and complicated which is best way to start this. I would also buy practice book which would be similar to the one above so you got questions to practice on. Videos are your friend too when you get stuck on any topic in the book and if you still don't understand it, I am sure reddit has place for math help.

If you get stuck or feel like you are wasting time and want to give up, please don't as you will get there! It won't happen in a day or week but maybe in few months you will finally understand most of it. Practicing is the key here. Good luck.