ill tell you what ive told my siblings with adhd  ill impart with you my technique for never being late -find out travel time to you destination -include additional travel eg walking from the parking lot stairs etc -add 15 min to this time thisll be the time you leave the house -add the time it takes for you to get ready brushing teeth showering pooping seeing etc -this final time will determine when to set your alarm to get readywake up   never rarely  these rough plans and alarms have always helped me