Well, this version of fdisk doesn't take care of CHS at all. Let change them to what we want - 63, 15, 8930.
First we will delete both partitions, as we now their placement according to the first partition info screen:
Device     Boot  Start     End Sectors   Size Id Type
/dev/sdb1  *      2048  133119  131072    64M ef EFI (FAT-12/16/32)
/dev/sdb3       133120 1200000 1066881 520.9M 83 Linux
So You are in normal (not expert) mode now. You can delete partitions with 'd' command. It will ask for partition number, please delete 1st and then 3rd.