Maths is all about practice, do questions from every topic that will be on your mocks, make a note of where you lose marks, try and figure out what you did to lose those marks and then attempt a similar question, and if you get stuck speak to a teacher
English lit and Spanish are about knowing the content. For English Lit I'd suggest making rough essay plans for topics that could come up, making sure you have quotes and make sure you are very familiar with the actual plot and themes - if you have forgotten, I'd suggest watching / listening to a summary and then actually rereading your texts closer to the summer exams. For spanish, obviously try and make yourself familiar with the key voab (and how it sounds) and also try and learn the tenses - I always struggled with this (I did french so it might be a bit different) but I found it much easier to just learn a few examples in each tense that I could use in my writing / use to help me figure out the tense in the reading and listening