I preparing for MHT CET 2020.Can I skip 3 or 4 lessons of PCM?

Hey,
The MHT CET 2020 exam consists 20 percent questions from class 11 syllabus and 80 percent questions from class 12 syllabus.
From class 11 the following chapters are important:
Mathematics-Trigonometric functions, Trigonometric functions of Compound Angles, Factorization Formulae, Straight Line, Circle and Conics, Sets, Relations and Functions, Probability, Sequences, and series.

Physics-Measurements, Scalars, and Vectors, Force, Friction in solids and liquids, Refraction of Light, Ray optics, Magnetic effect of electric current, Magnetism.

Chemistry-Some basic concepts of chemistry, States of Matter: Gases and liquids, Redox reaction, Surface chemistry, Nature of chemical bond, Hydrogen, s-Block elements(Alkali and alkaline earth metals), Basic principles and techniques in organic chemistry, Alkanes.
From class 12,the following chapters are important:

Mathematics:Mathematical Logic, Matrices, Trigonometric functions, Pair of straight lines, Circle, Conics, Vectors, Three dimensional geometry, Line, Plane, Linear programming problems, Continuity, Differentiation, Application of derivative, Integration, Applications of definite integral, Differential equation, Statistics, Probability distribution, Bernoulli trials and Binomial distribution

Physics:Circular motion, Gravitation, Rotational motion, Oscillations, Elasticity, Surface tension, Wave motion, Stationary waves, Kinetic theory, Wave theory, Interference and diffraction, Electrostatics, Current electricity, Magnetic effects of electric current, Magnetism, Electromagnetic inductions, Electrons and Photons, Atoms, Molecules and Nuclei, Semiconductors, Communication systems.

Chemistry-Solid State, Solutions and colligative properties, Chemical Thermodynamics and energetic, Electrochemistry, Chemical Kinetics, General Principles and Processes of Isolation of Elements, p-Block Elements, d and f Block Elements, Coordination Compounds, Halogen derivatives of alkanes (and arenes), Alcohols, Phenols and Ethers, Aldehydes, Ketones and Carboxylic Acids, Organic Compounds Containing Nitrogen, Biomolecules, Polymers, Chemistry in Everyday Life.
See,since the question paper mostly consists of questions from class 12th,so you should focus more on it. And be thorough with the chapters,you are fully prepared.
For detailed information follow the link given below:
https://engineering.careers360.com/articles/mht-cet-syllabus
Hope this helps.
Good luck.

Ya it is okay if you skip 3 to 4 lessons but make sure you are confident enough for other chapters and can answer their questions for sure. So you can count your assured marks from those chapters and can fluke over the 3 4 questions that gets asked from the chapters that you have left since there is no negative marking in the MhtCET exam.

Whatever you are doing, do it completely and thoroughly. Trust me on a scale of 10, 8 chapters done accurately and 2 left completely is BETTER than doing 10 chapters not so well. So do all the chapters that you do till their depth. This is my personal opinion and it had helped me a lot.

Best wishes. Thankyou. If you habve further queries, please feel free to ask in the comment box below.