Here's how to apply for a Masters in Science (MSc) in foreign countries:

1. Research whether the country you prefer offers an MSc in your subject of choice.

2. A very essential pre requisite is a bachelors degree in the same subject or a closely related subject in which you want to complete your MSc

3. You will need to appear in the GMAT/ GRE exams along with language assessing exams like TOEFL, IELTS, etc

Along with this, you need a good CV and some good letters of recommendation. Your application and essay needs to be perfect as well.