Yes, you can always upgrade Verbal Online or Quant Online to GMAT Online.
You may use the blue “Upgrade” button from within your course dashboard. You will receive pricing information upon clicking this button. Our upgrades always reset your clock to the full 6 months.
For example, if you upgrade Verbal Online to GMAT Online 45 days into the course, you will get full 6 months of access from the day you upgrade.