First things first, if you have any overdue loans or credit card bills, make sure to pay them off. Late payments can seriously interfere with your CIBIL score. Once you're all caught up, just try to pay your bills on time from then on. Getting a secured credit card can also be a good way to help rebuild your credit history.
Try to keep your spending in check and avoid applying for too many loans at the same time. If you stay on top of this, you’ll definitely see your score go up before you apply for that home loan.