What is the SP Jain cutoff for a purely score-based call ?

While they advocate a cutoff of 85%ile, you will need a score of at least 95%ile to get a purely score-based call. Even then, you might not be able to get the course of your choice. The same goes for XAT where you’ll again need 95%ile to shore up your chances of getting a call up. The chances to get a profile-based call-up are extremely low, so you shouldn't ideally consider it as a backup option.