heads up any knives and other hidden weapons will get you into trouble at the airport, things like alarms will go off, security detaining you, possibly missing your flight, being treated as a terrorist...

suggestion unpack anything that can be considered a weapon. airlines have websites that explain what can and cant be taken with you. maybe check on the website or call the airports you have to go through including those between Bulgaria and on to your final destination.

have your mother or who ever is your caretaker right now, help you pack she will know what you need to take, they will have a list of approved items the school gave them. and if this is a boarding school type situation your teachers, house person will have that list of what you can and cant take.

Also airlines are now charging by weight and number of bags so you might also make sure to take extra money in case your luggage and carry on goes over the limit for free.