the models which r supported -- do not allow u to do matrices
usually legally, they say u should use any casio FX which has less than 100MS, so u cannot use 100 MS. and all calculators which support matrices, r above 100 MS such as 991 MS and 570 MS ..
but for us the invigilators had no knowledge, nor she never checked the calculator cover..
she just told us to write the calculator numbEr on top of the exam paper.
so one guy used to bring FX 570 MS and used to write FX 82 MS