Probation

I'm a fresh grad and got hired for my first job two months after my graduation. It sort of happened rapidly and I was recently called to sign the contract with them as Monday is my joining date. On the contract, it says that I will spend first two months in an evaluation period after which I will be confirmed. Now I've heard many companies stipulate such a probationary period with new-starts, but I wanna know what are the important things I should take care of during this time? How do I prepare myself during these three days before Monday? Tbh, its kinda nerve-wracking aswell since I don't really know how I'll be judged. Need good advices, people!

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