How can you use a micro sd card to increase ram memory of a laptop?
Not possible
sd card is just a disk to store files on, it is not assigned to
the operating system.
Windows ReadyBoost
With Windows ReadyBoost, you can use a flash memory device, like
a universal serial bus (USB) flash drive or secure digital (SD)
memory card, to improve your computer's system performance without
having to add additional memory. The flash memory device serves as
an additional memory cache-memory that the computer can access much
more quickly than it can access data on the hard disk drive.