Hello Aspirant,
The cut-off of all the participating colleges is different and it also has not been declared yet so it is difficult to tell you the exact cut-off, however we can get a rough estimate from previous years' cut-off trends.
You must aim to score atleast 400 marks in the ST category in order to have higher chances of admission. In 2018, the ST cut-off marks in BHU were 382 marks.
You must aim to score 400 marks or above to have good chances.
Hope this helps.
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