Shivani, To be honest, it is very difficult to predict the cutoffs and the predicted rank of IIT JAM Mathematics, but we can make use of previous year trends to calculate the expected rank and cutoff. Firstly discussing with respect to the cutoff, it would be very difficult for you to clear the cutoff if your category is general but as in your case, of belonging to SC category, you may just clear the cutoffs as many coaching institutions predict this years cutoff to be around 20 but your chances of getting a good college is rather small. However, predicting the rank is a bit more difficult as it also depends on factors like total number of candidates and difficulty level of exam which varies every year and we cannot predict the toughness of this years' paper and its effect on the rank as of now. However, looking at past few years trends , you can expect a rank close to 7000-8000 in GENERAL RANK list (and not the category rank list which is very difficult to predict at this point of time), maybe even less depending on the variables as discussed above. However, it is still advised that do not rely totally on these predictions as they are largely dependent on previous years trends, however, it does help us in understanding our chances.

Hope this helps.