Harish Rathore

There are numerous apps which can help a lot of students. Like Physics-Wallah, Unacademy, Byjus's (quality going down), apps by big coaching classes. But they charge their services for full access. Some channels on YouTube might help and will be free.

But finally they can just help, they will help you more if you spend money on them, but ultimately you have to do hardwork. Guidance and a kick start and time to time push is very important but ultimately it is you 4-5 hours study daily (5 days a week) that will write success story for you.

A perfect time table would the one in which you give 4 "active" hours to study. This implies that you must spend 5-7 hours in the state of studying (depends on focus of the student).

Now, you can do this for 5 days a week or 6 days a week if you have 1-2 years to prepare.

One or one and half can be given in the morning if you rise up early (at least 6 am). 2-3 hours can be given in the evening before dinner and 1-2 hour can be given after dinner. You should keep it flexible but the only rigidity is that in total you must complete you 4 hours of active study daily for 5-6 days a week .

Misjudgement!!!

Yes, misjudging about the type of exam, difficulty level, preparation strategy, demand with consistency, own strengths, etc. are common mistakes done by people preparing for any exam so also for IIT-JEE exam. The exam is no doubt a difficult exam. But it is a fact that it doesn't matter how much marks one get out of the maximum, but the important thing is to get more marks than almost other 99%. So, difficulty argument fails here and one shouldn't be afraid of it. Secondly, the misjudgement is about the intellect required to score better than others. For example, a student who is extremely sharp in maths/physics can be beaten by the one who has completed must of the syllabus of all the subjects and skips most toughest question in the exam, saving time to do all easy and medium level question.  Thirdly, repeated practice and building speed in question solving is indispensable. There are others points to look upon but lastly, keeping yourself calm on the day of exam is also extremely important.

Until your child pass 5th class, he/she needs teachers trained specifically for children. Because at such age having an idea of level of understanding of child is very important, the sequence of things to be taught is important, how much time and how much repetition is required is to be known, etc. Hence, a special training is required. So, fees is also on the higher side for children of this age compared to a 6-10th grade students.

I think depending on the quality and performance of teacher, you can pay around 2 thousand for 20 group classes (of 5 or more students) for 40-60 minutes class each in a month.

No.

It is due to CONSERVATION OF MOMENTUM and not conservation of energy. 

Extra Info - In higher classes when you will read about four-vectors (hence four-velocity, four-momentum etc) the law of conservation of emeren and law of conservation of momentum will be combined into one as law conservation of four-momentum.