Think WEIRDO!
These are the situations that trigger the subjunctive:
Wishes, desires, orders
Querer, decir, preferir, desear, gusta, esperar
Emotions
Estar enfadado que, Me alegro mucho de que…
Impersonal expressions
Es importante que, es terrible que, es una vergüenza que…
Recommendations and suggestions
Recomiendo que, sugiero que, aconsejo que
Doubt and verbs of belief used negatively
Dudo que, no creo que, no estoy cierto, no es verdad
Ojalá
Ojalá que ganen
Top tip: Sieze every opportunity to use the subjunctive. For example, in a speaking assessment, deliberately state a negative opinion in order to sneak a few extra marks in there (Examiners LOVE it).