My existing subscription does not provide me enough student capacity, can I upgrade to a higher subscription plan in the middle of my subscription year?

Yes, you can upgrade to a higher plan anytime during your subscription. Upgrading to a higher plan will renew a new subscription plan for the next 12 months from the date you upgrade (For Example if the subscription was purchased on 2nd Feb 2022 then it would be valid for the following year. Now if you upgrade in between your existing subscription for example 8th November 2022 then your validity will now be 8th Nov 2023 rather than 2nd Feb 2023). You can then add new students right away.

You don't lose any settings or data when you upgrade to a higher plan, only the student capacity increases. All other settings remain as you have set them up.