The phrase ‘Up to the mark’ means -

Up to the mark
English Meaning: up to the required standard / up to the usual standard of performance, quality, etc.
Bangla Meaning: প্রয়োজনীয় মানসম্পন্ন

Ex. Sentence: His work hasn't been up to the mark.
Bangla Meaning: তার কাজ মানসম্পন্ন হয় নি।

Source: Website Lecture