most ppl will have 4 wisdom teeth... upper left, upper right, lower left, lower right..... but not all may be visible as it may be stuck hidden under the gum/bone..... some ppl may have one or more missing wisdom teeth... it's not 'hidden', it's missing... not formed at all.....

some... very rarely... have more than the complete 4 wisdom teeth! for example..... another wisdom tooth behind the lower left wisdom tooth....... wisdom teeth are known as 3rd molars... the additional wisdom teeth is known as the 4th molar.....

99% of the upper wisdom teeth can be removed by normal extraction.... 20% of the lower wisdom teeth needs surgery removal......

yes you can

I'm undergraduate student. Mayb can come to my uni for consultation? Normal extraction cost you around rm10. We have experienced specialist to supervise us.  So no need to worry much.