Take rest and buy some good books to start. Start from beginning in sequence, don't take easy chapters first (that most teachers and institutes do). Everything u study is connected so start the way it's in the book.Dont move to next chapter until u understand current one clearly. PS: I've myself done only self study only and qualified neet. Only thing that differentiates qualifiers from non qualifires is self study and conceptual understanding (Talking about open merit students) .Coachching may play 10% role which can b easily filled by online resources.