Some countries require recommendations from teachers (UK, US) and counsellors (US).
Teacher/counsellor recommendations MUST BE ASKED early - at least 4-6 WEEKS BEFORE THE APPLICATION DEADLINE.
Ask recommendation from a teacher that knows you the best (and might be connected to the field of study you apply to)
Notice! Applying "early" to UK / US requires also that you set up your UCAS / CommonApp account EARLY.
In UCAS the recommender has his/her own UCAS account:
References for UCAS undergraduate applications
CommonApp: Understanding the recommendation process
In CommonApp you invite the recommender by his/her email:
How do I assign my recommenders in CommonApp?