Take the course the test is built on.
Six topics, about an hour on your phone, and your card downloads the second you pass. Free retakes if you need one.
Quick answer

Six topics, and they are not a mystery. State rule spells out exactly what every accredited Texas food handler course has to teach, which means it also tells you what the assessment at the end can ask about.
Here is each topic, what it actually covers, and where people lose points.
Every accredited program in Texas must cover the same six areas, listed in the accreditation rule. Providers differ in tone and polish, not in syllabus, so a study plan built around these six works no matter whose course you take.
A few practical details that are hard to find in one place.
After the same six topics get taught a few million times, the failure patterns are predictable.
Honestly, most people do not need to prepare at all, because the assessment covers what the course just taught. The course is built around the six topics, the questions are pulled from the six topics, and the whole thing happens in one sitting while the material is still fresh.
If you want a plan anyway: skim the six topics above, note which ones you have never actually been taught (for most people that is time and temperature and allergens), then take the accredited food handler course and slow down on those sections. Pass, download, done. The whole thing fits in one evening. If you also serve or sell drinks, budget a second evening for TABC seller-server certification, which is a separate credential with its own assessment.
Four of the six topics are mostly common sense with a vocabulary layer on top. Two of them are not, and they account for most of the missed questions.
This is the section where the assessment stops asking what you would do and starts asking for a number. You will see questions about the temperature range where bacteria grow fastest, how long food can sit in that range before it has to be thrown out, the minimum internal cooking temperature for common items, and the hold temperatures for hot and cold food. None of it is hard, but none of it can be reasoned out from experience either. Read the section twice, say the numbers out loud, and you will be fine.
Kitchens have taken allergens seriously for a while, but the training tests a specific set of behaviors: knowing the major allergens by name, reading a recipe or a label for hidden sources, keeping allergen free orders separate during prep, and knowing exactly what to say when a guest asks what is in a dish. The right answer is almost never "it should be fine." If you do not know, you ask the kitchen, and the assessment rewards that instinct.
Because the two Texas food safety credentials have similar names, a lot of anxiety about the food handler test is really anxiety about the food manager exam. They are different things.
If a manager told you to get your food handler card, you are taking the first one. Nobody is going to hand you a hundred question booklet.
Six topics, one short assessment, about an hour of your evening. You retake the same course when it is time to renew in two years. Take the accredited food handler course, pay attention during time and temperature, and your card downloads the moment you pass.
It varies by provider. State rule requires accredited courses to cover six topics and allows programs to require a passing score, but it does not fix a question count or a passing percentage. Check your provider rather than trusting a number from a forum.
No. It covers the material the course just taught, it is unproctored, and retakes are normal. The topics most people miss are time and temperature numbers and the difference between cleaning and sanitizing.
State rule caps accredited courses at two hours. Most people finish in about one, including the assessment.
Yes. Accredited online courses deliver the training and the assessment together on your phone or computer, and the certificate downloads when you pass.
Accredited providers generally let you take the assessment again. Failing once costs you time, not the certificate.
No. The food handler assessment is a short end of course check that every food employee takes. The certified food manager exam is a separate proctored exam for the person in charge of an establishment.
One card, every kitchen in Texas.
Accredited course, about two hours, certificate the moment you pass. Valid in all 254 counties for two years.