Every program has different requirements. You will have to carefully analyze the individual requirements of the universities and colleges that you might be considering.
Apart from the requirements of the university and the program you have selected, you should also consider the requirements of the country you have selected to get a student visa. If you wish to study in the US you must have proof that you have finished your secondary school education and have evidence of financial support. For Germany you must first have a confirmation letter from the university before you apply for a student visa.
As for Australia, apart from the mandatory requirements of English language proficiency and proof of funds, you should submit the following documents for a student visa:
1. Electronic Confirmation of Enrolment (eCoE) certificate
2. Genuine Temporary Entrant (GTE) statement
3. Australian approved health insurance cover
4. Verification of your criminal records
For the UK you will need a sponsor for your Tier 4 student visa. And for Canada you need to submit clear medical records to be eligible for admission.