This is a regular verb. It follows the conjugation pattern of the verb hablar.
PresentPresente
Ella siempre se cerciora de cerrar la puerta.
She always makes sure to close the door.
PreteritePretérito indefinido
Antes de salir, me cercioré de apagar el horno.
Before leaving, I made sure to turn off the oven.
Present SubjunctivePresente de subjuntivo
Espero que te cerciores de la hora del vuelo.
I hope you make sure of the flight time.