Answer:
I would prefer you to make a schedule in a day whenever you have time like if you're studying 5 hours a day then do maths for two hours and after that you have three hours left then take one hour for each subject like 1hr for Chemistry , 1hr for History and 1hr for Spanish so that you can study atleast 4 subjects each day. But remember that everyday you have to do maths for 2hrs and after that you can randomly change the subjects like if you have completed 1 chapter from history then you can study physics. I didn't sent you a link or website but it's just a simple advice from me for being a topper. So I hope it will help you