for your grading there are some basic Japanese words you need to know
SENSEI TEACHER
REI BOW
MATTE STOP
HAJIME GO
HIDARI LEFT
MIGI RIGHT
SONO MAMA FREEZE
YOSHI UNFREEZE
OBI BELT
OSAEKOMI HOLD DOWN ON
TOKETA HOLD DOWN BROKEN
DOJO JUDO HALL
ZORIS SHOES
TATAMI JUDO MAT
You could make your own Judo dictionary. If there are other words that you want to know the meaning of then ask your Foundation Sensei.