So, it's like you have more time to self-study after the college hours. If you can utilize this time correctly, you will definetly be at your best!! As maths is your favourite subject, try to learn and solve problems when your bored.. ANd coming to chemistry, as always it is the most scoring subject. So try learning the concept and then solve problems. Don't at all make up your mind that physics is tough and boring, learn this subject conceptually and you will definetly win!!