IISER and IIST takes admission through JEE Advanced. IISER takes admission through SCB channel and KVPY as well.

You are appering in which exam?

If you are giving JEE Advanced you can follow below strategies-

- You should make proper plan for your study. Study by plan not by number of hours.

Your daily goals will need to include:
-topics you will study,
-preparing notes for the topics you have studied,

-solve practice questions or numericals related to the topics, and
-solve at least two practice papers, sample papers, mock tests, or IIT JEE past year papers a day.

Focus on important topics for your preparation-

PHYSICS- Mechanics,Electricity and magnetism,Thermal physics,Fluids and waves and sound,Potentiometer-related experiments,Optics and Modern physics

CHEMISTRY- Physical Chemistry,Organic Chemistry and Inorganic Chemistry

MATHEMATICS- Calculus,Co-ordinate Geometry,Vectors (and 3D Geometry),Algebra and Trigonometry

Below is the recommended books for your preparation

PHYSICS- Concepts of Physics Vol I and II by H.C. Verma,Fundamentals of Physics by Halliday, Resnick & Walker,Problems in General Physics by I.E. Irodov

MATHEMATICS- Maths XI & XII by R.D. Sharma,Plane Trigonometry Part 1 by S.L. Loney,Plane Co-ordinate Geometry by S.L. Loney,Higher Algebra by Hall and Knight and Problems in Calculus of One Variable by I.A. Maron

CHEMISTRY- Physical Chemistry by O.P. Tandon,Organic Chemistry by Paula Bruice Yurkanis,Organic Chemistry by O.P. Tandon and Chemistry XI & XII by NCERT

To get admission in IIST, you will have to clear Jee Advanced as this is the only way possible to get seat there whereas in IISER accepts 3 channels to provide admission KVPY, JEE ADVANCED, State or Center Board merit. Preparation tips are given below -KVPY -1.Analyse your performance and integrate your KVPY preparation with regular studies and refer to NCERT text books - KVPY aptitude test is basically a test of your fundamentals. Therefore, those who have studied NCERT study material thoroughly, cracking KVPY becomes easier. 2.Make a four-month strategy andpractice and revision as mush as you can.Also revisit question bank: avoid mistakes and start doing mock papers as well. Jee Advanced - 1. From every chapter identify one experiment as this will prepare you for comprehension and help you improve your reading skill in problem. 2. Assign a tentative timing for problem and never go for repeated reading of notes, it may help in Chemistry but not in Physics. 3. The paper timing must be most brain active timing of yours,ESSENTIALLY SYNCHRONIZE YOUR STUDY HOURS WITH EXAM TIMINGS. 4. Freshers solving last 5 year paper in stipulated time, this will help you in realizing the basic requirements. Boards - 1. Plan your schedule and note-making is an effective method also solve previous years' question papers. Understand the concepts while studying. Group study can help as studying in a group can help you to tackle those difficult areas and learn faster.

Hope this helps!!!