Since, you are in standard 11 you have a good amounyt o ftime which can be used constructvly and you should denote 7-8 hours every day for studies, such that you complete with studies in next 6months and have suffiecient time to prepare for board exams, as you shall need

Helo aspirant, its good that you want to prepare for civil servixes but make sure be patient and confidnen. You would face many difficulties during this journey but just believe in yourself. Here below i have provided the link. Its the bool written by Mrs. Ila tripathi .she has explained

Hey Gopesh! 

Try to read business times or mint for IIFT G.K session. As they usually cover international business related news like international firms and their tag lines, logo and recent economic policies. You can purchase Manorama of this year. Secondly, go through previous year GK session in the question

Indian Engineering Services (IES) is a national level exam which is conducted every year by UPSC. 

The following tips you can follow:

Firstly go through the syllabus of each paper of IES exam which you get in detailed notification of IES released by UPSC.

Go through basics of your core

GK Syllabus is kind of infinite so there is noa ny particular book for this. The exams of SNAP & IIFT has different type of GK questions. Here are some preparation tips you can prefer.

Read News paper daily

Go with current affairs & Magzines

Make notes on current Events

You can recommended below books for your preparation

-A Complete Success Package for Online BITSAT (With CD) : Comprehensive Coverage of NCERT Syllabus for Classes 11 and 12 (English) 4th Edition- Arihant Publication

-BITSAT Explorer (With CD) (English)- MTG Editorial Board

-BITSAT English Proficiency & Logical Reasoning PB

You can consider below names -

MHTCET BOOKS-
MHT-CET Engineering Entrance Exam Author: Editorial Compilation
MHT-CET- (Cd Rom) Author: Upaveda Learning Solutions Pvt. Ltd.
MHT CET – Chemistry (Marvel) For XII Science Author: Mayur Mehta, Chitra Joshi, Rekha Diwekar
MHT CET – Physics (Marvel) for XII Science Author: Bapat
Physics(Volume