ADHD dosage titration

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DS is 16, actually 17 next week. He has been recently diagnosed with ADHD.

He was initially put on a dose of 10mg methylphenidate for 7 days and then 3 weeks of 20mg. He was meant to have a review whilst on 20mg but that got cancelled by CAMHS. We were given another appointment after 3 week delay and DH took DS to it. They came back with a 20mg dosage prescription and a review in 6 months.
Does this sound right? My understanding was that he would be upping the dose to find the optimum dose which I thought would be higher than 20mg for his weight (59Kg). Is 20mg quite a low dose?
He finds it difficult to concentrate in class and the 20mg has made a difference, but a slightly higher dose might be even better - he has shown no side effects on the 20mg dose.

Is it worth contacting them to see what's going on?

Thanks

My son same age and weight (little under” on 27 but appetite decimated so back to 18mg, which sadly makes very very little difference

Is this concerta?

He was prescribed Medikinet XL 20mg

Dose varies hugely. I know a girl on 25mg and another on 110mg. He needs to find out what works for him. If he thinks his dose is too low, he should be able to try a higher dose.

I know that upping the dosage is more likely to cause side effects.

Thanks for your replies. He's trying 30mg now. He's focusing better (according to him), but also it took a while to stop him being a bit nauseas with it. Now he is saying that food tastes weird so he doesn't like taking it all week, so he's taking it when he's got a full day of lessons. I don't know whether to contact CAMHS again to ask if perhaps 25mg might be worth trying.