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the basic eligibility to take admission in b.tech course in Maharashtra that you should passed class 12th with minimum 50% from any recognised board.

You can take admission through merit-based and from entrance exams also, you have to qualify entrance examination like; JEE Main, MHT CET, JEE Advanced, PERA CET, SAT India. from these exam you may get admission in top engineering colleges in Maharashtra from you scores and ranks.

some of the top engineering colleges in Maharashtra listed below:

-> Indian Institute of Technology Bombay . Exam: JEE Advanced, UCEED, GATE, CEED, CAT and JAM
-> Visvesvaraya National Institute of Technology . Exam: JEE Mains, SAT, GATE and JAM
-> College of Engineering Pune . Exam: MHT CET and GATE
-> Defence Institute of Advanced Technology . Exam: GATE
-> Veermata Jijabai Technological Institute . Exam: MHT CET, GATE, MAH MCA CET and JEE Mains

For more information about Top Engineering colleges and their admission procedure in Maharashtra checkout given link below:
https://engineering.careers360.com/colleges/ranking/top-engineering-colleges-in-maharashtra

Hope you found it helpful
All the best!!!