See I think that I cannot help you much because I don’t know which stream you belong to. But I can tell you about some important subjects like :
- English – NCERT is always best. But for writing skills and note making, you can use bbc.
- Physics – NCERT again! But ULike for practice.
- Chemistry – NCERT for physical and inorganic. Organic can be done from XamIdea.
- Biology – NCERT is more than enough.
- Maths – Start with NCERT to clear concepts and do miscellaneous. For a cutting edge, solve RD Sharma(only those questions which have cbse tag on them)