The books are: Chebyshev's two-volume biology, Yarygin's biology and Chebyshev and Maksimov's "preparation for the Unified State Exam in Biology", although finding the latter is quite difficult. Yarygin, because these people have a different approach to presenting the material, and then solve tasks for Chebyshev + Maksimov. It also makes sense to prepare on the RESHUEEGE website in the biology section, the collection of tasks is huge. If everything is bad with figurative thinking and it is difficult to memorize the mechanics of bioprocesses, it is worth reading any more or less voluminous children's encyclopedia on biology
Before entering, I read the three-volume "Biology" by Taylor, Green and Stout. A beautifully and very interestingly written edition, even a little cult among biologists)
(fipi.ru) - the main site.
(yandex.ru) -here you can solve options, individual tasks.
(sdamgia.ru) - there are many tasks here of different difficulty levels to prepare for the exam, but I think it will be useful in any case.
(biorepet-ufa.ru) - as far as I remember, when I was preparing for the exam, this site even helped me a lot. Questions that can be punctured are well understood.
(bio-faq.ru) is another wonderful site, here not only tasks are analyzed, but there are simply many interesting articles, you can also take tests (usual and those that consist of questions that everyone usually fails).
(foxford.ru) - online preparation courses. You can take the first lesson for free, there are many additional materials that describe the topics well.
Of the books, my main book was D.A. Solovkova: Unified State Exam in Biology. Practical training (2nd edition). Here all the topics covering the course of biology necessary for passing the USE are discussed in great detail (he also helped me a lot for passing the additional entrance test in biology at Moscow State University).
Sometimes I looked here: A.Yu. Iontseva, A.V. Torgalov. Biology in diagrams and tables. But it is very short and does not fit the exam very well.