What am I?

Spot 5 differences in two Christmas tree below:

What is the last thing you take off before bed?

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 ?

Take one out and scratch my head, I am now black but once was red. What am I?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

You can see three almost identical images below. Can you spot the odd one out from them?

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??