If you choose a better company after signing the contract and that company agrees to hire you, then you must cancel the contract. You should contact the company you signed, and then you can sign with that company after you cancel the contract. If it is an enterprise outside the province, it must receive a special employment agreement outside the province, which is also in triplicate. After signing, you need to log in to the "Application for Employment Outside the Province" of Shandong University Graduates Employment Information Network, which will be mastered by your counselor, and the review will be quick. After passing, it will "input the contents of the agreement outside the province". Just fill in the agreement. Of course, it is even more troublesome to cancel the contract. So, you should think it over before you decide to look for a job.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.