Hello

To study medicine you need to appear as well as clear the medical entrance exam i.e NEET. It is the National level exam for admission in government, private colleges for medical dental and Ayush courses in India.
There are certain eligibility criterias for appearing in the entrance exam like age limit, academic qualification, nationality. The age limit for the general category candidates is 25 years of age and that for the reserve category students is 30 years and so you are eligible for the entrance exam. However, for the academic qualification, you should have  total 50% (for general category) aggregate marks in Physics, Chemistry, Biology subjects. For reserved category, it is 40%.
Well for this year-2019, you cannot apply for the exam as the dates for application form is closed and so you can appear in the upcoming year.

yes definitely you can try for MBBS even after 22 years age if we have a minimum aggregate of 50% in each of physics, chemistry and biology sense currently there is no upper age limit as preparing for Neet examinations and you need to be right with a basics and follow appropriate guidance and esteem institution is like Aakash or Allen or even take up the MBBS preparation course available in the careers360 platform
Mehndi you have to pay heed to the important chapters of thermodynamics, mechanism of modern physics and wave optics in physics, chemical energetics and kinetics in physical chemistry, hydrocarbons and carbonyl compounds in organic chemistry organic balancing inorganic chemistry and photosynthesis in botany, animal kingdom in zoology, Human Physiology chapters of cardiovascular, respiratory and nervous system as well as the chapters on biomolecules in the life cycles of plasmodium in microbiology and other relevant chapters of biotechnology on which many patients are being asked nowadays
the long and short of it is that you will have to be active in solving as many MCQs is you can on a daily basis and give time on MCQ examinations to improve your question selection and time management skills