Upto what grade have you studied?

[tufguy]

1) Upto what grade have you studied?
2) I have studied upto 5th grade.
3) I have graduated.
4) She went to school upto 4th grade and then stopped stdying.

Please check and correct my sentences.

 

[Tarheel]

Try:

How far did you go in school?

I graduated from ABC.

I went to school up to fourth grade and then quit.

 

[Rover_KE]

tufguy, note that 'up to' should never be written as 'upto'.

 

[Tarheel]

@tufguy, note that you study a subject. You don't study a grade.

 

[emsr2d2]

1) Up to what grade have you studied?
2) I have studied up to 5th fifth grade.
3) I have graduated.
4) She went to school up to 4th fourth grade and then stopped studying.

Please check and correct my sentences.

Sentence 3 has no place in this question. I don't know why it's there.
I don't find any of the others natural. I'd ask "At what age did you finish school/finish studying?" There are many different uses of "grade/year/class" across the world so you'd have to know what system you're talking about. It's a lot simpler to ask about the person's age.