As oldfogy has said, both sda1 and sda2 could be deleted, and then sda3 could be grown to the left. sda3 is an extended partition, and contains two logical partitions sda5 and sda6. These partitions (or more accurately, the file systems on them) all have to be unmounted to perform that merge and grow operation.
The contents of sda3 (containing
secondary logical partitions sda5 and sda6) will then have to be moved to the new beginning of the sda3 partition. Since the partition/s are barely utilised that shouldn't take very long.
It could be worth studying the existing grub configuration, usually found under /boot, to confirm that it won't all bork when the partitions and partition table are manipulated!
Good luck!
cheers, a
EDIT: what about going half-way, and shrinking sda2 from 56GB to 30GB or thereabouts, and then growing sda3 to absorb the free space released? Not familiar with Windows, but will it still boot if the recovery partition is deleted? If so, you could gain another 10GB from doing that.
EDIT2: Vague memories of it being a requirement that a volume has at least one primary partition. If so, sda1 and sda2 can't both be deleted, since that only leaves an extended partition sda3. Sometimes it is easier just to wipe a drive and install the OS from scratch
EDIT3: Logical partitions not "secondary" partitions.