Let’s just say I am out of state student for this one college but I am both going to undergrad and grad there.
Do I have a high chance of getting residency right before grad starts or like first year of grad or is it solely based on other things like if I am employed there or not?
I don’t believe that in most cases you can establish instate residency in the new state while you are attending college.
If you want to attend grad school at the same place or on the same OOS state as your undergrad, I would strongly suggest you contact that college and ask when and how you will be considered instate for your graduate studies if you have been OOS all during undergrad. They can tell you…and the answer might vary depending on the state and college.
Your previous posts indicate that you are considering the UC’s?
California has one of the strictest residency policies.
Since you would be coming for educational purposes, you could not establish in state residency by just attending school.
You would need to work, for at least a year, without attending school. You would have to survive on your own, no help from parents/family by paying your own rents, taxes, expenses and your income would have to match your expenses.
For grad school, you would have to be admitted first.
https://www.ucop.edu/general-counsel/_files/ed-affairs/uc-residence-policy.pdf
UCs are fine for me because my dad lives there. I’m just worried about other schools that I applied 
thank you for the other information.
For any state, Google the state name (and/or college name) and residency requirements. Then read every bit that comes up. State colleges, supported by state taxpayers, don’t want to give resident discounts to non residents. Very few exceptions.
And you usually can’t just show up one Sept and start working. There are timelines. For many colleges, once they set your residency for first year, that’s it.