You can refer below recommended books.

1. MATHEMATICS - B.S.GREWAL & YOUR B.E./B.TECH HANDNOTES.
2. THEORY OF MACHINE - by S.S.RATTAN, great book.
3. MECHANICAL VIBRATION - By V.P.SINGH
4. PRODUCTION TECHNOLOGY - BY P.N.RAO ( BOTH VOLUMES )

Another best book for numericals manufacturing portion is MANUFACTURING SCIENCE - BY GHOSH & MALLIK

1. MACHINE DESIGN - DESIGN OF MACHINE ELEMENT BY V.B.BHANDARI
2. THERMODYNAMICS - BY YUNUS CENGEL, GREAT BOOK. SECOND ONE IS THERMODYNAMICS BY P.K.NAG.
3. HEAT TRANSFER - BY YUNUS CENGEL. HEAT AND MASS TRANSFER BY R.K.RAJPUT.
4. FLUID MECHANICS & FLUID MACHINES - BY S.K.SOM OR YOU CAN USE FLUID MECHANICS - YUNUS CENGEL ALSO.
5. MECHANICS OF MATERIAL - B.C.PUNMIA
6. IC ENGINE - BY V.GANESAN
7. REFRIGERATION AND AIR CONDITIONING - BY C.P.ARORA
8. OPERATION RESEARCH- BY KANTI SWARUP