You say, escuela primaria, or just primaria. They'll know you're talking about a school.
No, it is not proper grammar. The correct phrasing is "you and I."
You have to take a test to get in so say you wanted to get into a grammar in year 8 then you would take an 12+
Many would say that Lancaster Grammar School and Royal Grammar School are among the best schools in Lancashire.
"School" in Spanish is "escuela".
perdonen mi gramática
If by 'big grammar' you are referring to important grammatical concepts, you could say: 'Esto es un concepto gramatical importante.'
To say 'I am going to school' in Spanish, you would say 'Voy a la escuela.'
To say 'I am going to school' in Spanish, you would say 'Voy a la escuela.'
Importante. Eem-por-TAN-tay
This is how you say Saturday school in Spanish la escuela los sábados.
No. It is proper to say someone graduated FROM high school. You can't eliminate "from."
The school principal in Spanish is usually called the Director(a).