cs1101x result and maths test review

CS1101X -> 26 upon 30 marks...
dunno is good or bad...
GOOD coz not many ppl get good grade..
BAD coz it is due to careless that i did not do better

example of a careless mistake:

try{
int a = Integer.parseInt("123");
system.out.println("ok");
}
catch(Exception e)
{
system.out.println("error")
}

SHIT~ i say it print "ok"... anyone with eyes (and programming bg) also know is wrong lor..
i think i am BLIND

edited: " i am not the one who is blind, is kim yoong, coz the above qns, i am right, it should print "ok" not "error".... duh..."

MATHS -> sux
i wonder why i got so many careless mistake

example of careless

x = -(2x+5) + 1
x = -2x - 5 +1
x = -4/3

careless no 1: copy wrongly, should be 2x-5
so i go change.. and...

x = -(2x-5) + 1
x = -2x + 5 +1
x = 4/3

!!!!!!!
i better go jump la....

how can 5+1 = 4?????? dun say base 10 lor.. there is no base that will accept this answer..
SHIT!!