Partitions 3 and 4 are part of the UEFI GPT boot records. They can not be deleted if you want your system to operate, plus they are small.
The recovery partition (2) is to allow you to reset your computer to factory standards.
I do not know what the first partition, Sonysys, is for but I would suggest leaving it alone or ask Sony but it is also small.
I really do not see that you would gain that much by changing your system partitions. It would really be better to get an external disk if you need more storage.
See this tutorial for explanations of UEFI UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with