GATE

GATE is required for higher studies like Masters in engineering (M.Tech). For B.Tech in NITs or IIITs, you must get a good rank in JEE Mains and Advanced or you require JEE Mains and Advanced for B.Tech in NITs and IIITs.
Good luck.

If you plan to skip college and rather study at a coaching centre. Small colleges usually don't have proper faculty or means for students. You will have a hard time understanding even basic concepts let alone the preparation of GATE.

If you are looking for distance education courses for GATE preparation, then Made Easy offers topic wise course material and previous years solved papers too. Career Launcher also offers topic wise question sets. Other institutes like Gateforum, Ace Academy, IES Academy. Along with distance course material you must join a test series to get a feel of actual test. You can better start preparing for GATE from 3rd year.

GATE is strictly for Engineering graduates only. B.Sc students will have to appear for M.Sc Exams to pursue higher studies.

Hello Harshita, Yes you can but you will have to appear for Aeronautical engineering paper in GATE.

GATE score of 14 is not enough for getting IITs. So you try GATE once more by going to a coaching. Or else, take up a job in your field of study and do coaching for GATE as part-time.