If you melted your last clutch, then I would say driver education is the problem and that you excessively 'ride' the clutch.
Due to the nature of this type of clutch (6 puk) it takes longer for it to stop spinning. Therefore when you are changing gears (with a 6 puk) you need to leave your foot depressed on the clutch longer while your selecting gear compared to a single plate clutch. Also due to this type of clutch it is very important that the 1000km 'bedding in' process is strictly adhered to.
Or, there could have been a problem with the installation. The wrong grade of grease could have been used and it may be getting on to the clutch plate facings, or the gearbox may have been allowed to 'hang' during installation. It could really be a number of things, but that fact that you melted your last clutch makes me think it’s the former.