It is mentioned that, (i) have an active Salesforce Trailhead account; (ii) sign up to Journey to Salesforce via trailhead.salesforce.com and (ii) have not previously completed the Journey to Salesforce Trailhead courses. I'm having that do they mean, we should only follow the course and complete after registering to j2s, because i've already followed it and complete, but gonna register now into j2s, and some one please tell me that, we can track for schwags unitl trailmix 3, but for voucher, where can we track it after completing trailmix 4a or 4b