I believe the Prepcast lectures cover critical path and float in passing detail. The exam simulator has several questions with detailed answers. You will need to go outside the Prepcast and exam simulator for additional questions and worked-out solutions. YouTube has several and there are a number of written resources as well.
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®