hi iqbal, it’s possible to use the pi’s builtin wi-fi as a hotspot i achieved this on the raspberry pi model B and B+ and serving the kolibri content on 5-7 devices at a time, but sometimes pi’s hotspot drops automatically at that time you just need to reboot the system. i first configured hotspot using hostapd but then went for isc-dhcp server which gives more stable connections.
hope this helps.
thanks.