I have no idea about Joca's premium picks , but he told me that he doesn't have record of his past picks and he doesn't know how much units he profited or what his ROI is
the pricing is really high as well so can't afford just testing it without having a solid info about the service ( as I remember 120$ for just 30 picks ) while I'm paying an average 25 euros for the paid tipsters I follow and they provide more than 30 picks a month with stable ROI

so can't check Joca's premium for the reasons that I mentioned , the odds for the picks may be low as well so basically I just have no idea at all how his premium picks work