tell me ,how to apply in automotive company for freshers . presently i am in btech 4th year from mechanical engineering .

One way for applying is to appear in the campus placements at your respective college (if at all companies come for campus recruitment there). The other way is to apply through job portals like moster, shine, naukri, etc by uploading your updated CV there. You may also apply directly to the automobile/automotive companies of your choice by finding out the email IDs of their HR personnel and sending your CV to them. Having your professional account on LinkedIn would also be a good idea to seek professional guidance and connecting with the like-minded people.