y13 will suck unfortunately but if you just want to work then maybe consider degree apprenticeships? you still get your uni degree but youre being paid to do it, many employers will look favourably on you as you will have x years of experience on post grads, no debt etc. if this sounds like something youre interested in then this may help to motivate you to continue pushing throughout the year
outside of that, just remember that this is definitely an important time in your life, but not the most important time in your life. put as much as you can into it and you will likely reap the rewards much later in life, but dont forget that you are a human and not an academic robot that's life is solely focused on education - live a little outside of your studies and it will all become easier