Aoa!
As far as acadmey is concerned I think that u must join a good one.Though you have to make effort yourself and no acadmey could spoonfeed you.The only benefit is that you can streamline your knowledge and you can interact with lot of people to gain from their knowledge and experience.Do consult a good library for your css preparation.
For Islamiat question:The length of my answer is about 4-7 pages and I quoted in Arabic.
For Pak Affairs:IH Qureshi book is good.You can memorize some paragraphs from there and book of pak affairs by Star book depot is also helpful.I also quoted from some other books in Quaid e Azam library Pak history section.Ikram Rabbani is another book I'd recommend .