The trick to studying a boring subject is to make it active and connect it to something you care about, instead of passively forcing yourself through it. Boredom usually comes from passive reading and not seeing the point of the topic, so the fix is to engage with it and give it meaning.
Make it active. Reading a dull chapter puts your brain to sleep. Turn it into questions, solve problems, make notes in your own words, quiz yourself, or explain it aloud. Doing beats reading, and activity kills boredom.
Find a reason that matters to you. Ask how this subject connects to your goal, a career, an exam you need, or even just the marks it carries. A subject feels less pointless when you see what it unlocks for you.
Study it in short bursts. Use short focused blocks of 25 to 40 minutes with breaks. You will tolerate a boring subject far better in small doses than in a long, dreary marathon.
Mix it with subjects you like. Sandwich the boring subject between ones you enjoy, so you do not face a whole session of it. Small, regular doses prevent the dread from building up.
Example: A Class 11 student in Pune who hated accounts started doing 30-minute sessions, solving problems instead of reading, and reminding herself it was essential for her commerce goal. It never became her favourite, but it stopped being unbearable and her marks rose.
One practical tip: Set a tiny goal, like just one topic or just 15 minutes. Starting is the hardest part with a boring subject; once you begin, continuing is far easier than the dread made it seem.