Hi Harshini

If you are good at Maths, I assume you are enjoying it too. Physics is just maths with the application of concepts. You just need to understand the concepts, know where to apply them, and then maths comes into the picture! If you feel bored while studying Physics, try reading only for example a third of the chapter's theory, then attempt it's numerical questions, I think you will enjoy it. As for chemistry, it doesn't require much time or concentration. However, you again need to grasp the concepts well. Most of class 12th Chemistry is organic and inorganic. In the latter, you have to learn a lot, and I suggest you to learn/memorise bits every day. Hope this helps!