CBSE 12th

The best approach for engineering admission is JEE Main exam conducted by National Testing Agency (NTA). The eligibility criteria for JEE Main is minimum 75% marks in 12th with PCM. the candidates appearing in their 12th final year of examinations can also apply for JEE Main. The JEE Main exam is conducted in the month of January and April of every year. The last date of online submission of application forms for this year was 06.03.2020. Hence you have missed this opportunity. The JEE Main scores are acceptable in all leading Engineering Colleges like NITs, IIEST, IIITs, GFTIs and State government. Engineering Colleges. On the basis of JEE Main scores you can also participate in JEE Advanced exam (Conducted among the JEE Main qualifiers), The good score of JEE Advanced can give you the opportunity for studying in IITs also. Despite from JEE Main scores acceptability, Private engineering colleges are also conducting their own entrance exams for admission to B.Tech courses. The top private Institutes like VIT, MIT, SRM, LPU, Amity University, TIET etc. entrance exams names are given below and can apply.
1. VIT : VITEEE
2. SRM University : SRMJEEE
3. Lovely Professional University : LPUNEST
4. Amity University : AMITYJEE
5. Manipal University : MAHE
UPSEE is another important engineering entrance exam if belongs to UP and the last date for online application is 15th Mar 2020.

For BHU
Syllabus for Mathematics: Differential Equations, Statistics And Probability, Permutation & Combination, Integral Calculus, Mathematical Induction, Complex Numbers, Sets, Relations And Functions, Mathematical Reasoning, Trigonometry, Three dimensional Coordinate Geometry, Binomial Theorem And Its Simple Applications, Matrix & Determinants, Limit, Continuity And Differentiability, Co-Ordinate Geometry, Vector Algebra, Sequence & Series. Syllabus for Chemistry: Chemical Kinetics, Equilibrium, Purification And Characterisation Of Organic Compounds, Chemistry In Everyday Life, p Block Elements, Organic Compounds Containing Nitrogen, Biomolecules, Organic Compounds Containing Halogens, Chemical Bonding & Molecular Structure, Co-Ordination Compounds, Electrochemistry, Environmental chemistry, Hydrocarbons, d And f Block Elements, Polymers, Atomic Structure, Some Basic Principles Of Organic Chemistry, Some Basic Concepts In Chemistry, Solutions, Principles and Processes of Isolation of Elements, Hydrogen. Syllabus for Physics: Motion of System of Particles and Rigid Body, Magnetic Effects Of Current And Magnetism, Universal Law of Gravitation, Kinetics Theory of Gases, Electrostatics, Dual Nature Of Matter And Radiation, Electronic Devices, Heat & Thermodynamics, Current Electricity, Optics, Waves, Work, Energy and Power, Physical World and Measurement, Kinematics, Electromagnetic Induction And Alternating Currents, Oscillations, Electromagnetic Waves, Communication Systems, Mechanics of Solids and Fluids, Atoms And Nuclei. Hope this solves your query.

If you are interested in the defence field, then you must have a strong knowledge of mathematics which is very important. After completing class 12th, you should join good coaching for NDA AIRFORCE and along with that, you can do graduation either BA or B.Sc, I think you should do BA, because it will be much easier for you than B.Sc, because you are already preparing for competition exam of defense which needs more focus and concentration. Keep studying the basic of mathematics and english in class 12. Because the syllabus of defence examination is much similar to the pattern of class 12th physics, chemistry and mathematics. So, keep learning from now onwards.