Hi @Sunnyjac no problemo! It's a big new world, isn't it.
I am not a pharmacist and know nothing about dosages but from what you say it sounds as though the initial dose is on the low side - which might be why it didn't have the magical effects your daughter was hoping for. If the dose is on the low side, then that'll be why it didn't help with the homework - the effects will have worn off by the time she got to her homework.
It would be worth keeping a diary for these seven days, to take to your next appointment. Make sure you mention about the lurgy, as that's bound not to have helped.
Other things to look out for: mealtimes, bedtime, amount of sleep, homework, how your daughter has felt during the day at school. Are they better or worse? Could go either way. You want to know whether it's the right medication, and whether it would be better with a higher dose.
Other medication options include a top-up dose for the afternoon, to help with homework. Maybe you'll need to ask about this in a roundabout way; "oh, the medication is really good in the morning but seems to have run out by the time school ends, and then Jane finds it really difficult to get homework done. Is there anything we can do about that?"
Aged 15, you want to get on top of the medication pronto ahead of GCSEs. It will take time to get it right - if you keep good notes then that will help. Take good notes over the weekend, when you can observe your daughter.
If you can, make friends with your pharmacist! They are super knowledgable people, and often really interested in this medication. In my experience, they know considerably more about it than any of the GPs I've met. They're really good people to be able to ask little questions. I have often found they're glad to talk about it - better than another conversation about Calpol!
Wishing you and your daughters all the very best.