Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 782 633
2) Placement test : grammar for beginners (anonyme) 5 999 654
3) A/AN (webmaster) 5 369 784
4) Auxiliary BE (webmaster) 3 226 458
5) Present continuous (webmaster) 3 002 244
6) Present simple (webmaster) 2 923 139
7) Present simple (webmaster) 2 600 133
8) Present continuous (webmaster) 2 439 316
9) Adjectives (webmaster) 2 094 968
10) A/an (anonyme) 2 017 869
11) Present perfect simple (webmaster) 1 648 601
12) Preterite (webmaster) 1 634 967
13) Vocabulary - Placement test (bridg) 1 620 551
14) Preterite (webmaster) 1 451 637
15) Short placement test (webmaster) 1 444 741
16) To be (bridg) 1 407 629
17) What time is it? (webmaster) 1 350 815
18) Present perfect (webmaster) 1 350 481
19) The alphabet in English (webmaster) 1 322 425
20) Adjectives (anonyme) 1 217 281
21) What time is it? (webmaster) 1 210 969
22) Numbers (webmaster) 1 189 394
23) 'A' ou 'An' (anonyme) 1 177 383
24) Two presents: present continuous, present simple (webmaster) 1 151 069
25) To be (bridg) 1 146 678
26) Comparatives / Superlatives (webmaster) 1 108 742
27) Numbers (webmaster) 1 072 018
28) CAN / MUST (webmaster) 1 059 680
29) THE/ A / AN / nothing (webmaster) 1 035 888
30) Comparatives (webmaster) 1 008 191
31) Family life (bridg) 1 001 970
32) Numbers > 100 (webmaster) 987 377
33) Future (going to/will/present continuous) (anonyme) 966 027
34) Plural (webmaster) 956 824
35) Superlatives (webmaster) 876 258
36) Adjectives (anonyme) 875 757
37) Simple present (bridg) 855 217
38) Spelled words N°1 (bridg) 851 176
39) Placement test beginners: Check your spelling (anonyme) 830 646
40) Introducing oneself (webmaster) 827 830
41) Adverbs of frequency (anonyme) 819 089
42) Family (bridg) 785 694
43) General test-End of high school / Beginning of university (webmaster) 783 800
44) Present simple (anonyme) 783 159
45) Frequency adverbs (webmaster) 778 587
46) Present BE + Ving (bridg) 766 663
47) Passive form (anonyme) 728 921
48) Genitive (webmaster) 724 391
49) Family tree (anonyme) 720 194
50) Preterite: simple or continuous? (webmaster) 717 942
51) Placement test (beginners) (lili73) 702 367
52) Past simple or present perfect (anonyme) 696 633
53) Future (webmaster) 676 658
54) Present perfect simple (bridg) 663 827
55) 2 Preterites (webmaster) 663 419
56) Preterite (webmaster) 622 311
57) List of 200 irregular verbs and audio (bridg) 617 216
58) Modals (webmaster) 613 394
59) Spelled words N°2 (bridg) 609 987
60) Modals (webmaster) 607 566
61) Height (webmaster) 606 871
62) Articles a / an / the (anonyme) 596 780
63) Plural forms (bridg) 578 412
64) Nationalities (webmaster) 574 925
65) Past continuous / Past simple (anonyme) 568 977
66) Irregular plurals (bridg) 554 464
67) Two presents: simple and continuous (webmaster) 550 439
68) Preterite (bridg) 549 901
69) Superlatives (frapedur) 541 435
70) Vocabulary: greeting people (here4u) 536 567
71) Give your opinion (bridg) 532 707
72) Adverbs of Frequency (bridg) 517 629
73) Present simple or continuous (anonyme) 513 013
74) Present perfect / preterite ? (anonyme) 511 843
75) Possessive case (anonyme) 481 292
76) Countries & nationalities (bridg) 474 185
77) Past tenses (bridg) 471 922
78) 'The' or nothing? (webmaster) 471 736
79) Introducing oneself (easy) (webmaster) 471 192
80) Passive voice (webmaster) 464 606
81) Present Simple vs. Past Simple (anonyme) 459 788
82) Questions : how to ask them (anonyme) 449 018
83) General Test II / End of high school / Beginning of universi (webmaster) 446 701
84) IN, ON, AT or TO? (webmaster) 446 089
85) Relative pronouns (webmaster) 445 687
86) Comparative of superiority (anonyme) 440 171
87) How to pronounce the final -ED? (past simple) (webmaster) 439 200
88) Relative clauses (webmaster) 424 088
89) Sounds: [h] (webmaster) 419 898
90) Comparative (anonyme) 415 056
91) Past simple (anonyme) 399 636
92) A/an/Ø (bridg) 399 541
93) Future simple (anonyme) 397 430
94) This / That / These / Those (webmaster) 393 050
95) Conditional (webmaster) 392 469
96) Passive voice (anonyme) 391 538
97) Comparing (webmaster) 388 441
98) Can / could/ may/ might (woodyrun) 380 478
99) Present perfect or past tense (anonyme) 378 848
100) Much, many, little and few (felin) 374 131
101) Personal pronouns (anonyme) 371 573
102) Preterite continuous (BE + -ING) (webmaster) 370 627
103) Genitive case (bridg) 368 785
104) Some, any, no, enough, too/too much/too many (webmaster) 368 593
105) Confusing words - Placement test (bridg) 364 884
106) Irregular verbs (webmaster) 364 326
107) Numbers from 1 to 10 (anonyme) 361 927
108) Past perfect simple, past perfect continuous (anonyme) 361 174
109) Present continuous or present simple (webmaster) 359 993
110) Present perfect or preterite? (anonyme) 358 421
111) Simple Past : regular verbs (anonyme) 354 371
112) Comparative Adjectives (bridg) 352 646
113) Who, Whom, Which, or Whose? (anonyme) 349 569
114) Past simple (video) (anonyme) 349 214
115) Past simple or past continuous (anonyme) 344 875
116) While / When (anonyme) 340 442
117) What time is it? (webmaster) 338 461
118) Modals (tinou) 337 021
119) Modal: may/might (anonyme) 334 579
120) Cardinal and ordinal numbers (anonyme) 329 132
121) The superlative (anonyme) 327 250
122) Possessive adjectives and pronouns (woodyrun) 324 895
123) How to talk about the weather (lili73) 320 948
124) Since and for (anonyme) 319 512
125) Flags (webmaster) 317 965
126) Irregular verbs (bridg) 316 521
127) Pronouns (woodyrun) 315 112
128) Prepositions - in, on, at (anonyme) 314 466
129) Tenses (anonyme) 312 745
130) Placement test 3 (webmaster) 310 865
131) Order of adjectives (webmaster) 306 956
132) Could/Couldn't (laure95) 306 555
133) Comparative (anonyme) 305 156
134) Adjectives and prepositions (anonyme) 304 451
135) Agreement Tags (webmaster) 304 388
136) Asking questions (webmaster) 303 574
137) Present perfect OR simple past? (bridg) 298 745
138) Questions in the past tense (anonyme) 298 166
139) Uncountable nouns (webmaster) 296 365
140) Superlative Adjectives (bridg) 296 219
141) Object pronouns (bridg) 295 976
142) Placement test 1 (anonyme) 293 200
143) Passive form (anonyme) 293 089
144) Present simple (anonyme) 291 931
145) Can/Must/Should (laure95) 290 977
146) Prefer/rather (bridg) 289 916
147) Past perfect (lili73) 289 852
148) Must or Have to? (woodyrun) 288 168
149) The/an/nothing (bridg) 285 700
150) To be (anonyme) 283 613
151) Can and can't (laure95) 282 577
152) Vocabulary: asking and answering (here4u) 280 486
153) Modal verbs (bridg) 277 588
154) Some / Any / no... (bridg) 274 733
155) Days of the week (bridg) 269 175
156) So / neither (anonyme) 264 565
157) Past simple (video) (anonyme) 264 028
158) Present continuous (chnawa) 261 466
159) Used to (bridg) 260 523
160) Should / must (anonyme) 260 097
161) Past tense (anonyme) 259 649
162) Vocabulary: on the phone (here4u) 258 807
163) Find out a quantity (webmaster) 258 724
164) Articles : a / an / the / Ø (anonyme) 258 026
165) Superlative + and adjective (anonyme) 257 694
166) Comparative and superlative (anonyme) 256 787
167) Numbers 1/100 (anonyme) 253 884
168) Modal can (video) (anonyme) 253 276
169) Comparatives (anonyme) 250 420
170) Relatives pronouns (who, which, that...) (anonyme) 247 880
171) A few, a little, few, little (anonyme) 246 191
172) Vocabulary: at the restaurant (here4u) 245 703
173) Would rather / would prefer to (anonyme) 244 706
174) Present continuous and the Going to form (anonyme) 243 160
175) Should/ have to/ must (anonyme) 240 829
176) Have something done (anonyme) 240 082
177) Used to/would (woodyrun) 238 111
178) The past (webmaster) 237 975
179) Future continuous and future perfect. (felin) 237 955
180) How to ask a question in English (bridg) 235 936
181) Pluperfect (webmaster) 234 365
182) I wish, if only (felin) 234 311
183) Some / any (younes91) 233 680
184) Countable or Uncountable? (webmaster) 233 639
185) Should / shouldn't (anonyme) 231 864
186) Present simple or continuous (bridg) 230 820
187) Adjectives - ing and ed (felin) 229 415
188) Hypothesis (webmaster) 228 525
189) Auxiliary BE (anonyme) 226 588
190) Must or mustn't (laure95) 226 487
191) Articles a/an/the/0 (bridg) 226 440
192) Article The or nothing (anonyme) 226 220
193) Present perfect with Ever - never - (anonyme) 226 115
194) Present continuous OR Present simple? (bridg) 225 670
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 223 086
196) To / in order to / so as to / so that (irish21) 220 941
197) Comparison (komiks) 220 435
198) Present perfect (bridg) 219 720
199) What time is it ? (anonyme) 217 851
200) Indirect speech (bridg) 217 462
