引用:
除了需要获得学校的录取通知书外,
还需要什么材料能够尽可能保证在移民局通过呢?

比如:足够的钱? 还有什么?
需要证明和B1签证支持公司已经没有雇佣关系的证明么?

引用:
To request a change to F-1 status or to apply for reinstatement as an F-1 student, you must submit your original Form I-94, as well as the original Form I-94 of each person included in the application

Your application must include your original Form I-20 (Certificate of Eligibility for Nonimmigrant Student) issued by the school where you will study. To request either a change or reinstatement, you must submit documentation that demonstrates your ability to pay for your studies, and support yourself while you are in the United States.