Care package for 16 year old doing exams

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I want to put together a care package to post to my 16 year old niece who is starting her exams this week. I have a few hours in the morning to go shopping and hope to get it posted in the afternoon. She's been really good about studying, probably a little too much tbh and I want her to know I'm thinking of her. She lives in the countryside with her parents, two younger siblings, cats, dogs and chickens, she's an absolute bookworm and recently spent the majority of her birthday money on books. She's not into fashion, occasionally wears make up but is starting to show more interest in things like that. Loves ear rings and has quite a collection. Is a Taylor Swift fan, often wears her fathers hoody's, footwear is almost always runners, mostly converse. She's a kind considerate kid who loves spending time with her grandfather who's in his 80's. I know the info I've given is random but hopefully it'll help with ideas of what I can get for her. I'm thinking of face masks, relaxing pillow spray, good quality chocolate, maybe a pair of pj's but after that I'm stuck. I don't have a daughter so really am lost as to what to send her, all ideas appreciated.

"I'm thinking of face masks, relaxing pillow spray, good quality chocolate, maybe a pair of pj's..."

These are lovely gifts but don't suggest 16 year old. You said she loves earrings - ETSY voucher, if that's a thing? You said she loves reading - book tokens?
You can't go wrong with cold hard cash at 16 tbh. Maybe something small - lipsalve, nail varnish, but Boots / Superdrug vouchers would also work.
What did you yearn for in the fifth year at GSCE time?

Snacks are a great care-package for exams! I get dd 14 her favourite ones especially when she seems extra nervous x

What a lovely aunt you are! I did this for my DD last year when she was sitting her final exams. I bought a basket and added things like bath salts, good quality body wash and moisturiser, lip balm, face masks, make up headband, silk pillowcase, fluffy socks, pens and notebook for revision, chocolate, popcorn. Basically items which would make her feel cared for and relaxed during a stressful time. My DD loved the effort I’d gone to and I’m sure your niece will too.

Pjs, fluffy socks, face masks for after exams.

Maybe some nice pens, sticky notes, highlighters for studying.

Chocolates, sweets, her favourite drink.

Maybe a gift voucher - if there’s a cafe she goes to for coffee, or maybe for a clothes shop to buy herself an outfit if she has a party or something after exams.

A nice card with a lovely message written inside.

Can't go wrong with consumables. Nice Marks and Spencer snacks or Waitrose ones ought to go down well. And if she's a bookworm, get her an Amazon gift card or a Bookshop.org one and say it's for her to use on reading for pleasure after her exams! I was a teenage bookworm and it was frustrating when people said 'we can't just get you books as presents' as I loved them.

Here's a good article that helped me with my DD: https://weareluna.app/parents/guides/confidence-and-motivation/exam-survival-kit/