If you struggle with telling the time and time keeping then set alarms. Try to make sure you can always see a clock where you live, even in the shower (cheap waterproof radios are great for this). Sand timers can also help as they provide a different way to visualise time passing. Try to make sure you get your clothes and everything you will need the next day ready before you go to sleep. This makes mornings less stressful and means you are less likely to forget anything. Leave a to do list on top of your clothes to make sure you remember all the important things you need to do each day. If it is on top of your clothes you have to look at it and it will be harder to forget to use the list.
Experiment with different watches and ways of showing time as it is useful to have one for time keeping in exams when you won’t be able to use a phone. 12 hour digital displays might work better for you and be a good way of getting more confident with 24 or analogue clocks.
Use sample or past exam questions to practice writing in exam conditions with extra time if you receive this for your dyslexia. This will help you to make the most of the time you have in an exam setting and to get in the right mental state more quickly when you take your exams.
In exams do not just sit down and start on the first question when you are told you can begin. Read the entire exam paper first and look for the questions with the most marks, start with those. Then if you run out of time you are more likely to miss out the questions worth the least marks instead of the ones worth the most. These are usually put at the end of test papers. On tests of reading comprehension read the questions about the text first, if possible. You can then just skim read the text until you find the information you need to answer each question, rather than reading the entire piece of writing.