If you are opting for self studies then it's a good choice. Just get some books of English grammar for any competitive exams, the syllabus is same. For aptitude you can approach any education portal to learn the basics. But the most important part is test series. So try to get some test series so you learn to manage your time. Moreover there's a self study guide for CLAT from Arihant. It's a good book you can check out.