is useful for you

[navi tasan]

Which are correct:
1-This book is useful for you to get prepared for the exam.
2-This book is useful for you to get prepared for the exam with.


3-This instrument is useful for us to measure pressure precisely.
4-This instrument is useful for us to measure pressure precisely with.

Gratefully,
Navi.

 

[Jenniferhu]

I'd choose #1 and 3. Not sure if they are correct or good to native ears, though.

****
NOT A TEACHER
****
Jenny

 

[Rover_KE]

I'd say

'You'll find this book useful for your exam preparation'.

'This instrument is useful for measuring pressure precisely.'

Rover