I have done foundation course for NEET but didn't study hard. Now I just have 26 days left for exam. Can I get selected for medical college in NEET by just preparing these 26 days ?

Now less than a month is left for Neet and now focus more on important chapters that means which carry more weightage. Instead of choosing a random topic from the syllabus, you must break your preparation into sections. Sub-topics from each section should be selected and then strategy on clearing concepts must be made. You can make short notes on the topics that you have find difficult to understand. To help you with you preparation we have http://learn.careers360.com/knockout-neet-may/
Never leave any concepts doubtful or unsolved. Once done with the syllabus and concept clarity, you should move towards solving previous years papers. Give mock tests as much as possible. Time management is one more important thing you should look upon. Remember that practise will increase your efficiency.
Give at least two mock tests every week. Then analyze your weak parts and work on them. If you find it difficult to prepare from books like HC Verma, DC Pandey, then only go for NCERTs. From wherever you study, you must complete NCERT Textbooks as many questions are directly asked from NCERTs.
Some important chapters you must focus on- For Physics, Motion of System of Particles and Rigid Body, Thermodynamics, Electrostatic, Current electricity, Electromagnetic Induction & Alternating Current, Optics, Electronic Devices. For Chemistry, you can focus on, Thermodynamics, Coordination Compounds, Equilibrium, Alcohols, Phenols and Ethers, Aldehydes, Ketones and Carboxylic Acids. In Biology, Human Physiology, Cell Structure, Genetics and Evolution, Diversity of Living Organisms. Biology is the most important subjects and carries more weightage than any other subjects to you must put all your efforts in Biology.