Juniper offers online courses for juniper switching and routing this summer, including lectures and lab with instructors. You also get discounts on prometric exams. This comes for free but places are limited so register early.
Let me also remind you about the Juniper fast track program, which is more targeted to experienced users and provides content and vouchers for exams.
A great opportunity to improve your skills, pass new certifications or simply refresh your knowledge on Juniper.