There are many books in the market for BHU UET. But while buying books, you should always remember to check if the book has previous question papers and sample papers attached. Check for the latest addition and also check if you can understand the language easliy. For Physics, Chemistry and Biology group, NCERT Books will be enough. Also you can study from Arihant Experts publications. Please check the BHU UET syllabus at:

https://university.careers360.com/articles/bhu-uet-syllabus