I recently did IGCSE English Literature, and my school chose Paper 1 and Paper 2. So basically, this is dependent on your school, but as you aren't doing this subject with a school, I would say that it's pretty much up to you?? I'm not very clear about this, as not many people take this subject as a private candidate from where I'm from, but I know that if you do Paper 1 and Paper 2, you would have to study 3 texts, along with the poetry anthology, which you don't have the luxury of having it in front of you during the exam. If you do Paper 1 and Paper 3 and Paper 4, you would have to study 2 texts (with the additional poetry anthology), and you would have to practice answering unseen passages well.