Buy them (you have no choice). Read them thoroughly for theory and definition-based subjects. But for Math and Science, keep a good guide or reference book open right next to them.
The NCTB textbooks for Classes XI and XII are the undeniable backbone of the higher secondary education system in Bangladesh. As the official board-prescribed books, they serve one primary purpose extremely well: covering the exact syllabus for the HSC examinations. nctb books of class xi-xii
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A Solid Foundation, but Don’t Stop Here Buy them (you have no choice)