Shogakko - Primary School
koukou - High School
Koukou Sei - high school student
*tada - just, only
*dake - just only
Asa - Morning
Asa Gohan - Breakfast
Gogo - Afternoon
Hiru Gohan - Lunch
Yugata - Evening
Yoru - Night
Yoru Gohan - Dinner
Tengoku - Heaven
Jigoku - Hell
*As you can see, "tada" and "dake" has similar meaning, if not, the same meaning, but the usage is quite different.
"Tada" is used at the front of the sentence, before the subject / object, whereas
"Dake" is used at the back of the sentence after the subject / object...