The question was: Should a ppl student who has just done stalls go to another school NOW to do some spin training (apparently he must have asked his own instructor or school and they won't or can't oblige).
The answer should honestly be: All in good time, now is not the time to change your rhythm.
I agree spin training is good (though preferably not in a PA38) but i strongly suggest you finish the PPL first and then take it up