What Is an International School and How Do You Choose One?

Updated 2026-09-23

An international school is a school that serves a globally mobile or internationally minded student body, typically teaching a curriculum other than the host country's national one — most often the IB, A-Levels, or AP — and usually with English as the main language of instruction. It's the right fit if your family is relocating, you want a curriculum that transfers across countries, or you're seeking a pathway to universities abroad. It's not automatically the right choice if your priority is local university entrance, deep immersion in the local language, or the lowest possible cost.

What makes a school "international"

The label is used loosely, so it helps to know what usually sits behind it:

A non-local curriculum. The school follows a framework designed for international students rather than the host country's national system.
English-medium instruction. Most teaching and administration happen in English, with local-language programs offered alongside.
A mixed, mobile student body. Families often include expatriates, returning nationals, and locally based families who want an international track.
External accreditation. Reputable schools are accredited by bodies that verify curriculum, staffing, and facilities.

The International School of Beijing (ISB) is an example of this model: it describes itself as serving students from Early Years through Grade 12 with an IB curriculum and a Chinese language program.

How international schools differ from local, private, and bilingual schools

The table below compares the dimensions families most often weigh. Treat it as a general guide — individual schools vary widely.

Dimension	International school	Local public school	Local private school	Bilingual school
Curriculum	IB, A-Levels, AP, or other international framework	Host country national curriculum	Host country national curriculum (sometimes with extras)	Blended: national curriculum plus intensive second-language instruction
Language of instruction	Usually English	Host country language	Host country language	Split between two languages
Credentials	International diplomas; strong study-abroad pathways	Local diploma; local university pathways	Local diploma	Often dual-track or blended credentials
Typical student body	Internationally mobile and internationally minded families	Local families	Local families	Local families seeking language fluency
Cost	Usually the highest of the four	Lowest (often free)	Moderate to high	Moderate to high

The key trade-off: international schools optimize for portability and study abroad, while local and bilingual schools optimize for integration into the host country's system and language.

Common curricula and how they differ

If you're comparing international schools, the curriculum is often the deciding factor.

IB (International Baccalaureate). A continuum of programmes spanning early years through the Diploma Programme. Known for breadth, inquiry-based learning, and a strong emphasis on writing, research, and independent thinking. The Diploma is widely recognized by universities worldwide.
A-Levels. A UK-origin system where students typically specialize in three to four subjects. Suits students who want depth over breadth and know their strengths early.
AP (Advanced Placement). US-origin college-level courses taken alongside a high school diploma. Offers flexibility — students choose how many and which subjects — and is common in American-style schools.

None of these is universally "better." IB favors well-rounded students who handle many subjects at once; A-Levels favor specialization; AP favors students who want to build a customized course load.

Practical factors to evaluate

Use these as a checklist when researching or touring schools:

Accreditation. Which external bodies accredit the school, and are they recognized by universities and ministries you care about?
Teacher qualifications. Are teachers certified, and what is their turnover rate? High turnover can disrupt continuity.
Class size and student-teacher ratio. Ask for actual numbers, not marketing ranges.
Language support. If your child is not yet fluent in the language of instruction, what support exists — and is it included or extra?
University pathways. Where do recent graduates go, and what counseling is provided?
Curriculum continuity. If you may move again, does the school's curriculum transfer cleanly to schools elsewhere?

The admissions process, step by step

Shortlist schools based on curriculum, location, and language support.
Check eligibility and requirements — some schools have residency, passport, or language criteria.
Submit an application with school records, and often test results or an assessment.
Attend an assessment or interview, which may involve both the student and parents.
Receive a placement decision and confirm enrollment.

Expect the process to take weeks to months, so start early if you're relocating.

Questions to ask on a school tour

What curriculum do you follow, and how is it assessed?
What accreditations do you hold?
How do you support students who are new to the language of instruction?
What is your average class size and teacher turnover?
Where do your graduates typically go to university?
How do you handle a student who is ahead or behind in a subject?

Signs of a good fit — and red flags

Good fit:

The curriculum matches your long-term plan (local vs. international university).
Your child's language needs are met with concrete, named support.
Staff can answer specific questions with specifics, not slogans.

Red flags:

Vague or evasive answers about accreditation or teacher credentials.
No clear language-support program despite a multilingual student body.
High staff turnover with no explanation.
Promises about university outcomes that aren't backed by actual graduate data.

The right international school is the one whose curriculum, language support, and university pathway line up with where your family is heading — not simply the one with the most recognizable name.