Hello

NIT MCA Common Entrance Test (NIMCET) is a national level exam and it is conducted for admission to the MCA programs offered by NITs. If you are asking about books for preparation of the exam, you can refer to-

MCA Entrance Tes Self Study Guide by Arihant
Excel with Objective book for NIMCET.
Various books are available in the market for preparation of NIMCET exam. You can also solve sample papers and previous year question papers for practice.

According to the NIMCET exam pattern, questions in the exam are asked from the following subjects
Mathematics, Analytical Ability & Logical Reasoning, Computer Awareness, General English.
Duration of the exam is two hours and exam is conducted in offline mode.
Language of the exam is English.
Total 120 questions are asked in the exam.
As per the marking scheme, four marks will be awarded for every correct answer and for every incorrect answer one mark will be deducted.

Good Luck!