The Oxford 3000 list is available for free on the Oxford Learner's Dictionary website with audio. Listen to the pronunciation of the word after you learn the Bangla meaning.
Most Bengali speakers get stuck at an "intermediate" level because they lack the 3,000 core words. Crossing this threshold moves you from "survival English" to "fluent English." Oxford 3000 Words With Bangla Meaning Pdf Download
Option A – Semi-automatic (Recommended) The Oxford 3000 list is available for free
Option B – Manual but accurate