joining in a normal college without jee preparation and taking byjus jee preparation is a good decision to crack jee(by practicing 2 to 3 hours a day)

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Talking about syllabus for JEE mains which is only NCERT so what you need to do is to cover all the topics in NCERT and taking coaching is good idea to know how well you are performing in exams and you will get idea about patterns and current scenario. A list of tips for JEE preparations-

• Have a study plan as per the subject. Study each concept, make notes, and solve as many questions required to strengthen your grip over the subject. In the case of chemistry, have a clear understanding of chemical equations, chemical compounds, phenomenon, and its properties. Learning about chemical compounds and their properties will help you relate different concepts in chemistry. For mathematics, start studying general topics that are applied in other chapters. Some of the general topics include trigonometry, coordinate geometry, differentiation and integration. Make chapter-wise formulae and important-point sheets that can work as a revision sheet during the exam. For physics, try to understand diagrams and read chapters carefully. Additionally, create a chapter-wise formula sheet that comprises all formulas and laws discussed in the chapter.
• Solve as many questions possible from every topic that you study. This will help you understand the type of questions asked from each topic and you will know how far you stand from your target score. Maintain an error-log and keep resolving your doubts instantly. This will help you know your weak points.

• The study is only effective when you keep up with revision. Making short notes will help you revise efficiently. Moreover, it's not possible to study each and every topic from the prescribed syllabus during the last days. Hence, have some space for revision in your time table. Solving questions is an important part of revision. Through revision, you will be able to identify the points you missed while learning. Solving JEE Main previous year question papers is also a good practice as it allows you to know the type of questions asked in the exam.