How can you abort a foetus by myself?
You can't. The so called home remedy's either does not work or are unsafe. You have to go to a doctor. See more info in related link below.
Taking a medicine without talking to your doctor first would be very dangerous. You get get an infection or even die. Or, the medicine mght not abort your baby but instead leave him or her brain damaged or physically disabled. If you are serious about getting an abortion, you need to go and see your doctor or school nurse.