The timed test is usually about 4 times as much time as you need if you know your subject matter. If you really knew the subject you'd wonder why they gave you so much time.
Learning math is alot like learning a language. It is repetition that gets you familiar with it and once it is hardwired into your brain it is a native skill.
The questions are like answering a crossword puzzle or something similiar.
If you have only done home schooling then it might be worth your time and money to find a Tutor to help you get through this challenge.
Math is a discipline and a pretty tough go to try and figure it out yourself if you lack the aptitude. Although it is a skill that can be learned by anyone.
Some other tips that may help you. When taking the test, cover up with scratch paper all the other questions and writing that do not apply to the question you are working on. As in photo reading or remote viewing your perceptions will pick up everything and add confusion to what you are working on, isolate what you percieve.
There is a book somewhere that has all the questions and answers to the test you are taking. Only study the correct answers, do not read the wrong ones. You will associate the correct answer with each question if you do this.
Go through the material at least three times.
You will pass.
All the best.