I scored 54 marks in MHT CET, 59%ile in JEE & 59% in boards. Will I get admissions in any engineering colleges?

Sorry to say but it is very difficult. But don't worry you can get admission in some private colleges with some kind of donations.

Hey aspirant.
See the marks u have scored in the JEE mains u won't be able to grab aany of the seats in the good colleges like NITs IIITs or GFTIs for pursuing ur higher studies in the field of ur interest under the btech courses. U should be going for leivafe colleges like LPU, MANIPAL ,. SRM , KIIT , VIT , etc for ur btech career. I m providing u a link for ur help.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/mht-cet-cutoff/amp&ved=2ahUKEwjF4pKHraPiAhWQfisKHbUBDOcQFjAKegQIAhAB&usg=AOvVaw1o-AknZcI0tdutT8qeuHMQ&ampcf=1&cshid=1558123261167
Ask if any query. Good luck

With such a marks it's little bit hard go for private institute best of luck or rest go for council upto 3-5 rounds