How can I start GRE preparation from basic to advanced level with resources at home? I'm a student of CSE. How do I start my preparation?

Basic Level Prep:
1. Give a mock GRE test. It will help you know your strong and weak areas, and you can strategise your preparation accordingly.
2. Start with ETS official guide. You will know more about the syllabus for quants, verbal and help understand question types.
3. Start with Barrons 333 words for oral.

Advanced:
Switch to Manhattan books for better practice of questions and concepts. Try to give at least 5 to 6 mocks before the exam. Study Barrons 1100 words. And one week before GRE starts with AWA preparations.
ETS + Manhattan is sufficient for practice. If required you can also refer to Kaplan material.
On the day of the exam stay calm and hydrated.
All the best!

The GRE^® test has three parts - Quantitative, Verbal and Analytical Writing Assessment. The following is the GRE^® test structure:

An unidentified un-scored section is included and will appear in any order after the Analytical Writing section. It is not counted as part of your score. An identified research section that is not scored may be included, and it is always at the end of the test. 

GRE revised general test has six sections
1). Analytical Writing Assessment: It has two separately timed tasks.
* issue
* argument
30 min per task
# scoring on a scale 0-6 with half point increment. It means the scores you will get like: 2 or 2.5 or 3 or 3.5 or 4 or 4.5 or 5 or 5.5.
Next 2 Quantitative reasoning sections & 2 verbal reasoning sections. And one unidentified unscored sections. Out of these five sections, you will get parts in this pattern.
Q V Q V Q (3 quants two verbal)
Or V Q V Q V ( 3 verbal two quants).
Out of these three sections ( 3V or 3Q), One section is an unidentified unscored section. It means that we can't identify, which is the unscored section. So we have to write all the parts carefully. I am a quantitative reasoning trainer:
In verbal you will get question types:
- Sentence equivalence

- Text completion

- Reading comprehension
I am now coming to Quantitative Reasoning.
Topics tested
* Arithmetic

- Number systems

- LCM & HCF

- Fractions

- Percentages

- Profit, loss & discount

- Simple interest & C.I

- Ratio proportions

- Time, speed & distance

- Time & work
* Algebra

- Exponents

- Equations

- Inequalities

- Absolute values

- Sets

- Sequences
* Geometry

- lines, angles & polygons

- triangles

- quadrilaterals

- circles

- co-ordinate geometry

- Solid geometry (3D)
* Data Analysis

- Counting principles

- Permutations & Combinations

- Probability

- Statistics

- Averages

- Data interpretation

- Question types:
I. Quantitative comparison
II. Multiple choice questions: Select one answer choice
III. Multiple choice questions:
Select one or more answer choice
IV. Numeric entry questions (like fill in the blanks):
Scoring on a scale 260-340 with one point increment. It means the scores you will get by integers only with no negative marking.