Introduction
The Joint Entrance Examination (JEE) Main is a highly competitive examination conducted by the National Testing Agency (NTA) for admission into various undergraduate engineering programs in India. The JEE Main score is used as a criterion for admission to National Institutes of Technology (NITs) and Indian Institutes of Information Technology (IIITs), among other institutions.

Scoring in JEE Main
JEE Main is conducted in multiple sessions, and the scores are normalized to ensure fairness across all sessions. The marks obtained in JEE Main are converted into a percentile score, which represents the relative performance of the candidate compared to others. The percentile score is used for ranking the candidates.

Eligibility for NITs and IIITs
To be eligible for admission to NITs and IIITs, candidates must meet certain criteria, including a minimum score in JEE Main. The eligibility criteria vary for different institutes and courses. The cutoff marks for admission are determined by the respective institutes based on factors such as the number of applicants, the difficulty level of the exam, and the availability of seats.

Possibility of Admission
Based on the given information that you have obtained 153 marks in JEE Main 1st session, it is important to note that the cutoff marks for admission to NITs and IIITs can vary each year and for each category (General, OBC, SC/ST). Therefore, it is not possible to provide a definitive answer without considering the specific cutoff marks for the year and category in question.

However, it is advisable to analyze the previous year's cutoff trends to get an idea of the expected cutoff marks. This information can be found on the official website of NTA or other reliable sources. By comparing your score with the previous year's cutoff, you can estimate your chances of admission to NITs and IIITs.

Factors to Consider
Several factors can influence your chances of admission to NITs and IIITs, including:
1. Category: The cutoff marks differ for different categories. The general category usually has higher cutoff marks compared to reserved categories.
2. Seat Availability: The number of seats available in each institute and course can also affect the cutoff marks. Highly sought-after branches might have higher cutoff marks.
3. Performance in Other Sessions: If you have appeared in multiple sessions of JEE Main, your overall performance across sessions will be considered for final ranking and admission.