I need 5 credits 2 get into 10th grade but...?

[Kawaii]

Okay so I need 5 credits 2 be in the 10th grade but I have 4.
I am currently taking Summer Night School for Math.But I have failed both math and science but they only let you take one course so I chose math. And they only give you half a credit so I will be left with 4.5 credits. A lady who works at the school told me that I will still be considered a 9th grader but I will have some 10th grade classes. And that I should take night school when school starts again which is in August until November to get the other credit. And then I will be able to take the 10th grade Fcat and thats it. She didnt tell me more cause I had to leave. I tried to ask again the next day but she said that I should go to the school website but theres no info about my question. All I want to know is what happens after I take the 10th grade FCAT? Will I have not need to take the 9th grade classes anymore? Will I be in 11th grade after that year? Or would that make me a 10th grader with a few 11th grade classes?
I dont wanna keep asking her too many questions cuz i had to have her explain it 2 me a few times till I got it but then I had more to ask but I had to leave...and also cuz shes not really in charge of all the promotion and stuff...the only person who could help me most are the counsolers...but ALL the counsolers dont work in the summer...so i cannot ask them.