Dear everyone,
Sorry for making you check back to my blog so often when I hadn't posted the answers.
I fell sick over the weekend and was knocked out by the medicine I had to take.

UPDATE for Revision Paper 2:
Q29) Answer should be 3h 55 min. Thanks for pointing it out.
Q 26) The answer is 1 1/10.

Answer Key for Science Booklet A
1) 3
2) 4
3) 1
4) 2
5) 2
6) 4
7) 2
8) 1
9) 4
10) 4
11) 1
12) 4
13) 4
14) 4
15) 3
16) 3
17) 2
18) 1
19) 3
20) 3
21) 1
22) 2
23) 2
24) 3
25) 4
26) 3
27) 2
28) 3
29) 1
30) 4