If the Wi-Fi is poor in the kids bedroom why not consider a powerline unit.
Although I have a BT mesh kit my son still uses a powerline for stability in his bedroom. A pair of 100mb powerline set cost around £25. We had a 100mb TP-Link powerline from when we had Talktalk 35. Although they rated at 100mb it would not go above 65mb on speedtest. So I later upgraded to 1gb powerline and sold the 100mb on ebay.
TBH 65mb on a powerline for schoolwork is plenty but my son is a teenager and wants the full speed for games download 😞
The speed may also depend on the electrical wiring of the property. I had my house fully rewired 15 years ago so cables are decent condtion.
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M200 Oomph - 5GB SIM + 3 extra SIM family plan - BT whole Wi-Fi - Sky Q
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Don't cry over Virgin price increase instead speak to retentions team and negotiate a better deal.