first. dint panic I found my method half way through year 11 and still got great grades thankfully and it was different for each subject. try finding out what type of learner you are u can do that through an online quiz I found I was a mix of auditory and visual so u would make mind maps and voice note them in my phone and listen to them. I would also make flash cards for science and read then out loud. with these flashcards I put a question on one side and answer on the other the aim was to have quick firey questions made it easier to go through and remember once I knew all the content I would do exam questions started with foundation qs then went to higher. before u make these flashcards make sure you've made notes and understand the content. use free science lessons and primrose kitten. For maths to learn the content use a check list and watch Corbett maths and hegarty. remember u cant exceed in maths if u dont know the basics so practice the 'easy' parts so u know it like the back of your hand then go to the complicated stuff whilst learning this so practice papers lots and lots of them. extra revision methods can include mind maps, post it notes, etc try to condense your notes so at the end u dont have to flick through books of information x hit me up if u need anymore advice