Why would your teachers move you now? with less than a month to go from the exam, I think it's a bad choice. Looking at papers, the higher paper question 10 tends to be similar in difficulty to the final questions in foundation for edexcel, as I do it too.
But regardless, I'd reccomend using cognito for science. do the quick quizzes, and maybe watch the short videos. For maths you need to learn how to do method. cognito or maths watch, or maybe hegarty would be good with that. do practice questions, loads.
Good luck