Yes Hafiz, I graduated STPM with a CGPA of 4.00. I would say, STPM is very difficult. It is said to be the hardest examination in this nation. Therefore, it would be unreasonable if I tell you it is easy. You must be able to handle the stress.
You will be given plenty of assignment. Also, ensure that you are focus in class. Focus on what is being thought in class and always try to study on your own. Read and read and read until you understand the knowledge. Discuss with your friends and always ask questions to your teachers.
Finally, remember that studying is about gaining knowledge. There is no point if you are able to obtain a good result but you are not knowledgeable. Don’t wait till last minute to do the practise questions. Enjoy your days in Form 6. I enjoyed mine and it was Form 6 that thought me a lot which helps me to cope up in my university. All the best!