How long would it take to learn content.

I just moved countries and found out i need to sit GCSE exams this year. I need to do english language, English literature, maths (higher), biology and chemistry (higher) the timing is really bad, but what websites can i use and what can i do to get a 5 or 6? Please help even if i fail my parents will still blame me. I will lock my phone and distractions away what do i do