Just see

You must answer 100 questions in 120 minutes, out of which 60 are of 1 mark and 40 are of 2 marks.

So mathematically you have 0.857 minutes (50 seconds) for 1-mark questions each and 1.714 minutes (100 seconds) for 2-marks questions each.

Marks wise time distribution of subjects occurs as:

But this is not how we really use time during exam. Generally, Mathematics requires lesser time and Physics requires more time than as in table. Time usage pattern usually occurs as in following pattern (but it is not mandatory).

Physics > Mathematics > Chemistry > English

During Examination

1. Maximum use of calculator
   Using calculator tricks, you can solve most of the Mathematics questions faster than you can solve with process. Doing this you can save some time for other subjects.
   
   
2. Note and leave the confused question
   If you are confused in some question or you feel like you need more time solving it, just note the question number and leave it for last. If you solve easy questions first then it will raise your confidence which aids to solve difficult questions.
   
   
3. Attempt passage at last
   Passage can really confuse you and can waste most of your time. While reading you feel like you are understanding the passage, but while reading questions you must read it again. It would be much better if you solve it at last.

Taking these tips into consideration, try solving some mock exams and test series. Practicing enough mock exams can help you discover your own pattern of problem solving and time management.

Before examination

Before examination, we must be fully prepared for Physics, Mathematics, Chemistry, and some chapters of English. Some chapters of English include:

1. Conditional sentences

2. Question Tags

3. Sentences Types and Transformation

4. Voice

5. Transformation

6. Tense and Aspect

7. Infinitives and Gerund

8. Subject Verb Agreement

These chapters are mentioned here as you can answer questions from these chapters by knowing some formulas and patterns. Studying chapters like vocabulary, preposition, passages are not fruitful. You can study the general pattern for solving the questions of phonetics and stress but it is not necessary that you fully go deep into it.

Main priority must be given to Physics and Mathematics. You shouldn’t always go with shortcuts and tricks. You need to understand the main idea of the chapters. Questions are mostly asked to test your concept regarding the subject matter. First you understand the subject matter then you can create your own shortcuts.