Think about it this way: the work you are putting in now is for the people of your future. If you can’t work for yourself, work for them! Your future SO, kids if you will have them, friends, being able to afford a classy Thai meal out rather than a greasy takeaway on a Saturday night. Think about it that way: your time invested now will become triple the better time you will have in the future. Remember you are only in y12, and you must have done well at GCSE to be doing Maths and Chemistry as those are tricky subjects. You have probably relaxed a little after the stress of year 11. Use the half term to get back into the ‘efficient worker’ mindset and then continue through with that into y13. Good luck!