http://i67.tinypic.com/wv6djm.jpg 

have you seen this? it basically outlines possible paths u could take to study overseas. now that u already done with SPM, u need to decide quickly as to whether to go for STPM or A-levels. alternatively, u can take SAM or AUSMAT if u wanna go to australia. however do not take KPM matriculation if u wanna go overseas as it will severely restrict ur choices of university as well as scholarship.

with STPM/A-levels, ur choices of schools will be open to all commonwealth countries as well as the americas and the far easts.

It doesnt matter so long as u score them!

nobody can guarantee that. but we can make the possibilities higher by:

i. getting top grades in STPM or A-levels. NOT FOUNDATIONs.
ii. getting a place in an overseas university. this one is the easiest part.
iii. getting a scholarship to pay for the fees and possibly living expenses there.

points ii and iii highly depends on point i. usually people are stuck at point iii, and would have to resort to study loans between RM400k and 700k. young malaysians in general cant even buy a house at RM200k let alone service a RM700k loan. it'll take u ur whole life, especially with basic fresh grad pay at RM3k.