Form 6 is not a waste of time. People say it's a 2 year course, students waste a lot of time doing nothing, blah blah. That is simply not the case. Sure, you will have 6 months of doing nothing before classes start on June, but use this time, buy all your Form 6 books and start studying NOW. Trust me, this will give you a tremendous advantage when STPM starts. And when STPM ends, you'll be able to register using forecast results to get into Jan intakes of most private uni/colleges, so no problems there.
As for not enjoying Form 6, believe me when I say all that struggling will only increase friendship bonds between your classmates. You'll learn to be more independant and more resourceful, rather, you MUST or you'll just be another statistic of the system. Form 6 has formed in 1 1/2 years what 5 years of friendship couldn't do. Since you are not such a bad performer, you should have no problems (I only had 2A1s in my SPM but I didn't find the actual exam to be that tough). It's all about what you want to achieve.
Most sci stream ppl who go into arts do so either because they have such a clear goal of where they want to go, or because they are scared that science might be too tough. I don't think you fit into the former, so it's best to take science and keep your options open, although I am not sure the flexibility of going into local university's art stream later on with a science-based STPM. However, private institutions of education will accept anything. After all they just want to profit.
If you want to take the a-levels, then rest assured that you will have no problems in private education. All you need is a fat bank account.
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