Es fundamental realizarlo para tener claros los elementos del enunciado, principalmente la identificación de la situación a resolver.

Iwould say d run disk cleanup on the hard drive

Lymphocytes must recognize antigen and respond to another signal generated by microbial infection to become activated.

You should learn as many programming lanauges as you can or be a skid and copy and paste! you should have an iq above 110. you should also try to study some operating systems both new and old to get an understanding of what they are. you should definitely learn java because it is very important to know in this line of work unless you want work as a professional skid. i would also get my c.i.s.s.p. and c.e.h. and a degree in computer science.