The patterns worth recognising, and the things no legitimate organisation will ask you for.
The FAFSA costs nothing to file, correct or re-file. Any service charging to submit it is charging for something you can do yourself at no cost at studentaid.gov. Some of them are legal; none of them are necessary.
The same applies to 'application assistance' priced as a subscription. Read carefully what is actually being sold before paying for anything in this area.
Nobody can tell you what you will receive before you have applied, because eligibility is decided by the programme and by the school against information you have not yet submitted. A guarantee is the clearest single sign that something is wrong.
That includes a specific figure presented as yours. A range published by a programme is information; a number attached to your name before you applied is not.
No legitimate organisation needs your federal student aid username or password. Anyone with them can alter your application and redirect money.
Nobody should ever have them but you. If a service says it needs them to help, that is the end of the conversation.
Names that resemble a government department, seals that resemble an official one, and urgency about a deadline that is not real are the common dressing. The actual agency does not cold-call offering to secure you a grant for a fee.
When in doubt, go to studentaid.gov directly rather than through a link you were sent, and ring your school's aid office.
Send it over. A person reads every message, and if the real answer belongs to your school's aid office we will say so.