Use of calculator in cpt prepration

Hi

I m a 2007 Passout  B.com ,was working with HDFC bank ,Now a days I m a housewife Always wanted to do C.A but now i m luking fwd towards it .

Saw Sections of Cpt ,quiet Familar but I have to study it again.

Plz help me with the specific guidelines or study material to prepare,if any As well as wanted to know about use of calculor ,Is it allowed in Exams & if yes then wht model?

Your time isreally appriciated on this.