Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

What does the rebus below mean?

TEN BADTION

Mother's Name is Mrs. SIXTY TWO
Son's Name is FIFTY TWO
Daughter's Name is FORTY TWO
What is Name of Father?

Can you name an animal whose killing cannot be performed without spilling your own blood?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.