You can't (legally) pick and choose. You are "domiciled" in one state at a time. That is the state you intend to stay in, have the most ties to, etc. The details can vary from state to state and are "fuzzy" (i.e. no black and white rules.) See for example
https://www.mass.gov/service-details/learn-about-legal-and-residency-status-in-massachusetts
(read the "Legal Status" and "Changing your domicile")
If you change your domicile to Mass then you need to get a Mass drivers licenses and I would think you would not likely be eligible to get CT in-state tuition. But that is up to CT and their rules. Those appear to be here and are very similar to Mass rules.
(linked to from Uconn's page here):
As far as taxes go, you will be taxed by your state of domicile on all of your income earned world-wide. Each state you work in will tax the income you earn while working in that state (or on income from owning a business or rental property instate, etc.0 Frequently, your domicile state will give you a credit for any taxes paid to another state.
Sometimes your non-home state will not require you to file taxes if you make below a minimum amount.
Turbotax can help you with this, but you need to buy two state returns, and it is always a bit complicated.
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