Preparing for O-levels can be a challenging and daunting task, but with proper planning and preparation, it is possible to excel in the exams. Here are some tips to help you prepare for O-levels:

1. Start early: It is important to start preparing for the exams early, preferably from Secondary 3, so that you have sufficient time to cover all the topics and revise before the exams.

2. Set realistic goals: Set achievable goals for yourself, such as finishing a certain number of practice papers or covering a certain number of chapters in a week.

3. Create a study schedule: Plan a study schedule that includes time for revision, practice papers, and breaks. Stick to the schedule as much as possible to ensure that you cover all the topics before the exams.

4. Understand the exam format: Familiarize yourself with the exam format and the types of questions that will be asked in the exams. This will help you to prepare more effectively and efficiently.

5. Practice past year papers: Practicing past year papers is one of the best ways to prepare for the exams. It will give you an idea of the types of questions that may be asked and help you to identify areas that you need to improve on.

6. Seek help if needed: If you are struggling with certain topics, don't hesitate to seek help from your teachers or tutors. They can provide you with additional resources and guidance to help you understand the topics better.

7. Take care of yourself: Finally, it is important to take care of yourself during the preparation period. Get sufficient rest, exercise regularly, and eat a healthy diet to ensure that you are in the best possible condition to tackle the exams.

You can skip O-levels if you get into an Integrated Programme, students usually need to have a strong academic record and a good track record in co-curricular activities. Some schools also require students to take an entrance test or go through an interview process. It is best to check with the individual schools for their specific requirements