the easiest one is to create a bootable usb stick with its usb installer. boot the computer with it and tests will be run automatically iinm.

how to do it ? 

http://memtest.org/#downiso

edit: run the usb installer, and follow the steps.

how to boot from usb drive ? i have followed the steps and the pendrive's name became MULTIBOOT now .

after the test is completed , need to change the boot options again so that it can boot to win 10 ?

no.

I have tried it severa;l times , i gt into the advanced startup menu and selected the pendrive that contain the bootable file , but the pc restart , no memory test , dunno what's wrong . 

did you disable fast boot in bios as explained at the beginning in the article? if you did, disable also secureboot in bios. (normally not necessary)

please read the whole thing. there are many ways to do this in the article. if option one didn't work, try the next one.

i assume you're not actually technical savvy but wanna learn something out of this, so i try to help you out as much as i can. however, you really need to help yourself. btw, tenforums.com is a good place to learn about w10. go ahead and check their tutorials out. it helps.

ya , i disabled it . it still boot to win 10 . 

try option two in the article. on boot, press repeatedly the key that lets you boot with other devices (normally on post screen they will tell you which key to press, eg. esc, f11, f12)

Tried that, but still boot to win10....

try this: once you're in w10 desktop, try reboot it (not shutdown). once the screen goes blank/black, spam (press repeatedly) the particular key that gets you boot device menu/options. the settings of fastboot and secureboot must be disabled in bios.

it's funny that you cannot do this, because it's basically the common way to boot other bootable devices (dvd, usb stick). it's just that not all mobos/laptops use the same key for this purpose.

what computer are you using? (if it's a desktop computer tell me the mobo model; if it's a laptop tell me the brand and model)

Asus a555l laptop

the correct key to spawn for common asus laptops is esc key. firstly i think you need to set up your bios properly.

1. press and hold f2 key, power up your laptop. continue to press and hold the f2 key until bios screen is shown;
2. goto boot tab, enable launch csm; make sure fast boot is disabled;
3. goto security tab, make sure secureboot control is disabled; press f10 to save and exit bios; turn the computer off.

then,

1. plug in the usb stick;
2. press and hold esc key, then power your laptop. press and hold until you see boot menu list is shown;
3. select usb stick from the boot menu list.

if this cannot work, i don't know what will sorry.
I still can't boot to the bios screen. Can I use the setting>recovery> advanced startup to reach the bios screen???
edit: after tests are completed (when you decide to stop it), make sure check the first part to restore respective bios settings to the original ones, or your laptop will not boot normally.

yes you can.

you have a weird asus laptop. i just happened to have an asus laptop running w10 beside me. the first part was what i did to goto bios screen. the second part was how i choosed different usb devices to boot. tested and verified.

i followed the steps that you told me , yet still boot to win10 .       btw , i have run the windows memory diagnostic tool , no problem found . Back to the topic now , it 's the gpu driver that caused BSOD ? P/s : I also got into the bsod setting theu the advancved startup options , but not thru pressing f2

ok. built-in mem tests are short and simple. however it's not that thorough.

yeah i suspected that it's your igpu driver.

maybe a clean install will make it work. (since you were not able to goto bios or boot from other usb devices, i think you never did a clean install before)