Can I still be able to chnage my international driving license to a polish national license without having to go thru driving school and practical test again?
No. The international driving permit (not a licence!) is merely a translation of your licence into other languages, it is NOT a driving licence by itself.
Either replace your licence, or you'll have to do the Polish theory and practical test.
Be warned - if you get stopped while only having the IDP, you'll be prosecuted for driving without a licence.