I can't recall any hard time during my form 4 (and even form 5) year. Only the week before SPM was very stresses. The projects won't hurt, just do it in time, especially your moral project and addmath project. If you are lazy to do addmath project, please do not risk it. At least (not recommended) "refer" to your friend's project and change the values and presentation. Keep it up! Secondary school life is very enjoyable~