Hello,

GATE Exam will be conducted for a duration of three hours including two types of questions-multiple type question  and numerical answer type questions, a total of 65 questions will be asked with two parts such as general aptitude ad biotechnology which has five sections such as engineering mathematics, general biotechnology, genetics, cellular and molecular biology, fundamentals of biological engineering, bioprocess engineering and process biotechnology, you can check out the full syllabus at https://cache.careers360.mobi/media/uploads/froala_editor/files/BT_Uor9fzY.pdf

Recommended books are as follows;

• Biotechnology by Pranav Kumar
• Fundamentals of Biochemistry by Lehninger
• Principle of Bioprocess Engineering by P. Doran
• GATE Biotechnology by GK Publishers
• Life Science part 1 and 2 by Pathfinder publications
• Immunology by Kuby
• GATE General Aptitude and Mathematics by GK Publishers
• Molecular Cell Biology by lodish and Baltimore
• Bioprocess Engineering by Schuler & Kargi
• Bioprocess Engineering principles by Pauline Doran
• Molecular biology of the gene by James Watson
• Immunology by Kuby
• Advanced Engineering Mathematics by Erwin Kreyszig
• Principles of Gene manipulation by Primrose & Twyman
• Gene cloning and DNA analysis by T.A Brown
• Plant Biotech by Slater

You can get the previous year paper at https://engineering.careers360.com/articles/gate-question-papers to help you in your preparation process.