Hi I have ADHD. Inattentive with a dash of impulsive, but no hyperactive. From what I can remember (ha!) at school:
Very compliant in theory but failing in practice. Labelled "lazy" at school: always appeared to be capable of doing the work "if I felt like it" - classic ADHD brain forcing switchoff when the subject isn't interesting. Would appear to daydream in class. Wouldn't do homework. Would mean to, would want to, but was literally incapable of forcing myself to do it. School reports dire. DIRE.
Advanced early reader (read Lord of the Rings aged 9) but huge problems writing: slight dyspraxishness and brain would not slow down for hand to catch up so by the time I was halfway through a sentence, I'd forgotten what it was.
No organisational skills. Constantly losing gym kit, forgetting to bring notes home. Teacher had to get other kids to pack my bag every day or I'd turn up to every lesson with the wrong books or no books at all. Compensated for poor memory by understanding everything: went into Physics O level with no equations (in those days you needed lots) and started the exam by deducing all the equations from first principles before reading the paper and applying them to the questions. Absolutely useless at anything that required any degree of rote learning: languages, for instance. OK at Latin because only translating from Latin to English, and you can make a fair guess at it if you have a good English vocab, which you do if you read that much as a kid. But useless at French. Good at English once I managed to write properly - good imagination is an ADHD trait. Couldn't learn my times tables and can't do mental arithmetic, but 2 Maths A-levels, both A grades. Thrown out of University 3 times.
Now? I can only remember things that are "meaningful" - at work would forget important project dates until I had got far enough into the project to associate the dates with something I was interested in. Complete inability to remember dates and times otherwise eg hospital appointments (it's not whether you care about it, alas, it's whether it is inherently interesting and hospital appointments aren't). Don't know my own mobile phone number. I don't know what I'm doing tomorrow, until I look at Outlook. Without Ritalin, I wouldn't know what I'd had for lunch. Will get sucked into things (emails, books) and become irrationally cross if interrupted. Unusually sensitive to noise "interruption". May start daydreaming halfway through a conversation, sentence even and just gaze into space. Dire timekeeping: poor sense of time and unaccountably find myself late when I made a huge effort to plan to arrive on time. Inability to do admin - it's grownup homework really, isn't it? Occasional flare-ups over things I'll take way too seriously.
Record number of umbrellas lost in one year: 16. Record number of times for microwaving the same cup of tea because it went cold before I remembered I had it: 12.