Mock’s 😱😰😫

Hi, I’m British and due to take my mocks (practice GCSE’s or exams) in a week. I’ve tried everything to try and remember information I really need for these exam’s yet nothing seems to be going in. I am worried that I am going to fail and let my Mum down as I am supposed to be the brains in my family. Although these are just try outs I am still really worrying over them I don’t want to be the only one with a low mark. I am currently taking: triple science, French, business studies and obviously RE, English and maths. I am mostly struggling with French and my Mam saw that so got me a private tutor. I can’t really talk to my Mam about it or teachers as I’ve left it abit too late. So any advice would be appreciated. Thanks.