Upgradation from 11.X to 12.1.4

Hello,

We have 2 partition on the SEPM server, C (where OS is installed) and d drive,Previous version installed in d drive it has 30 GB space but c drive has got approximatly 1 GB space.

Can we upgrade the SEPM from 11 to 12.x.Is this sufficent to upgrade from 11 to 12