1. There is no problem per se to study in a foreign country.
2. You are allowed to use the meal if the reliable authority issues the Halal Label and you become sure it is reliable.
3. Your body treated as clean in case you are not sure the Najasat has been contacted with your body. There is no need to examine and act upon your doubt if you are dubious it is najas or not.
Appendix:
The grand maraja' answer regarding the above-mentioned question is as follows:[1]
The office of Grand Ayatollah Khamenei (May Allah grant him long life):
1. There is no problem per se.
2. You are allowed to use the meal in case you are not sure it is slaughtered legally.
3. The body which it comes in contact with Najasat is considered as Najas.
The office of Grand Ayatollah Makarem Shirazi (May Allah grant him long life):
1. There is no problem if it is necessary and causes not to support infidels and weak Muslims and not to be impressed by their illegal manners. It would be nice if they propagandize Islam by their speech and behavior in those areas.
2. You are allowed to use the meal if you become sure it is the real label and Halal.
3. If the excretion wasn’t along with Najasat it would be treated as clean. Otherwise, there is no need to examine and act upon your doubt it if you are dubious it is najas or not.
Office of Grand Ayatollah Saafi Gulpaigani (may Allah grant him long life):
1. Since keeping faith and belief is actually difficult in foreign country and journeying or migrating to such that places may cause immorality and carelessness and you ought not to preserve your faith and morals you are not allowed to study there. Otherwise, there would be no problem if their traditions and habits couldn’t impressed you and you ought to keep your faith and morals firmly and preserve your Islamic independence with doing your canonical duties and tasks.
2. There is no problem if you buy meal from those Muslims whom you guess their deeds are accurate, otherwise you are not allowed to eat meal which sells in foreign country.
3. It would be treated as clean it you are not sure your body comes into contact with Najasat or not.
An answer by Ayatollah Mahdi Hadavi Tehrani (may Allah grant him long life):
1. There is no problem to study in a foreign country.
2. If the Halal label has been issued from the reliable authority it would be no problem to act upon it.
3. Your body treated as clean until you are not sure it has become unclean by coming into contact with najas or mutanajjiss (an object which is become unclean) or to be in touch with the transmitted moisture.
Link to Istiftaat Website.

---