I currently have a subscription that will expire and have one reset available. If a renew it would I be able to do a reset later on? or should I just buy a new subscription?

Hello, my advice is for you to renew before it expires for the following reasons:it`s cheaper, it won't break the flow of your studies. Also, you will be able to use your previous "one reset " in the new subscription.
I hope this helps.
Regards.